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NTSE Class 10 Biology Part 2 Chapter 4 to 6

Phytohormones

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Phytohormones are

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Who demonstrated that cut tip of canary grass seedlings resume phototropic sensitiveness when pasted back in its position?

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Avena coleoptile test to find out the amount of growth promoting hormones was discovered by

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Which one of the following nutrients is concerned with the growth of the plants in view of their role in synthesis of auxin?

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A high concentration of synthetic auxin is generally used for

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Which of the following is a weed killer?

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Storage sprouting of potato can be prevented by

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Which of the following is responsible for apical dominance?

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Auxin inhibits the growth of_______________

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Mowing of a grass lawn facilitate better maintenance primarily owing to

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Which of the following hormones can replace vernalization?

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Which ofthe following test will you perform to demonstrate the presence of gibberellin?

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Which one of the following is primarily concerned with cell division?

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Cut leaves remain green for longer time when dipped in

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The growth regulator that retards ageing of plant organs is

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Which one of the following is a naturally occurring growth inhibitor?

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During adverse environmental condition plants develop a stress hormone, which is

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Abscisic acid controls

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Ethylene is a

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Which one of the following triggers the ripening of fruits?

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Photoperiodism is

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Which of the following factors influence the flowering in plants?

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In many plants the change from vegetative to reproductive phase takes place in response to

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Phytochrome is used

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The pigment that absorbs red and far red light in plants is

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Chemical agent that has important role in flowering is

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What is vernalisation?

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Nervous system

57 Qs

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The simplest form of nervous system that integrates body activities is found in cnidarians and it is known as

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The first animals to have nervous were probably similar to modern

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The longest cell in the body of an animal is

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Which cell stops dividing after birth?

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The largest number of cell bodies of neurons in our body is found in

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Which of the following is not a function of neuron?

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Axon is characterised by

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Largest part of the brain of man is called as

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Which part of human brain is more developed in comparison of others?

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Hearing is controlled by

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The appetite and satiety centres in the brain are located in the region of the

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Thermostat is an instrument by which one can regulate the temperature of an oven, a heater or a refrigerator. Functionally, a similar mechanism is located in the mammalian brain in the region of the 

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Which part of mammalian brain controls the muscular coordination?

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Spinal cord passes through

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Afferent nerve fibres carry impulses from

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How many pairs of spinal nerves are present in a human?

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There are how many pairs of cranial nerves in a human?

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The second cranial nerve is called as

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The vagus nerve is the cranial nerve numbering

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Which one of the following cranial nerves plays an important role in regulating the heart beat?

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A man suddenly sees a tiger. His heartbeat goes up, blood pressure increases, etc. Which hormone is released at this time in his body?

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A reflex arc does not involve

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The organs which give response to external and internal stimuli are known as

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Receptors of pressure present in deep layers of skin are known as

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In mammals Meissner's corpuscles are found in

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The inhibitory effect of vagus nerve on the heart is due to the secretion of

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Which is not true of a synapse?

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The speed at which impulses are conducted increase with

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Reflex arc is formed by

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Behaviour that involves an external stimulus triggering a genetically determined response is called

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Sight of delicious food usually makes mouth watery, it is a

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If a man could learn to stop his heart beat at will, he must have control over his

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In mammals, the autonomic system is composed of

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Which of the following is not a characteristic of the human sympathetic nervous system?

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Eye lens is

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The amount of light falling on the eye lens is controlled by

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Part of the eye, which is devoid of blood vessel?

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The cornea and lens of the mammalian eye are both

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Which part of the donor's eye is used for grafting in order to cure certain cases of blindness?

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Which of the following helps eye to adjust the focal length of the lens?

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In human eye, at the blind spot

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Concave lens is used to correct

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Suppose a person wears convex glasses for proper vision. Where do you think the image of the object will be formed in his eyes when he is not using the glasses?

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A person uses concave lenses, if he sees after removing its spectacles, then in his eyes image ofthe object will be formed

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Too short an eyeball or too flat a lens produces

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Reduction is the elasticity of eye lens with age may result in

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The compound eye of an insect

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A person going up to 10,000 feet high in a hot balloon may develop severe pain in the ear due to

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In mammals, the middle ear ossicles from inside to outside are in the sequence of

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The structures in a human that provide balance are located in the

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Semicircular canals in vertebrate are responsible for

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Which structure helps a person to maintain his equilibrium?

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The site from where the nerve impulse for hearing originates in mammals is

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Cochlea of mammalian inner ear is concerned with

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Suppose you felt an earthquake, which of the following sense organs would you think was involved in this feeling?

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You are riding a bicycle and take a sudden turn around a sharp corner. The organs involved in the maintenance of balance is

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When a person rotates rapidly for a sustained period of time it results in the sensation of dizziness and impaired ability to walk steadily. This is because

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Endocrine system

48 Qs

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Endocrine glands put their secretions directly into

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The first hormone to be isolated was

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According to the accepted concept of hormone action, if receptor molecules are removed from target organs

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Which one of the following statements about hormone is correct?

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Hormones of hypothalamus are called as

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The secretion of the following pituitary hormones is controlled by hypothalamus

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Pituitary gland is found in

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Which one is not secreted by pituitary?

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Anterior lobe of pituitary secretes

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Gonadotropins are secreted from

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Growth hormone is secreted by the

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In an accident the anterior pituitary of a four year old boy was severely damaged but the boy survived. What is likely to happen?

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A gorilla like man with huge hand and legs. This is due to the abnormal secretion of

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Hypersecretion of growth hormone by pituitary results in

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The synthesis and release of thyroxine from the thyroid gland is stimulated by

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LH and FSH are called as

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Follicle stimulating hormone is produced from

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FSH is to estrogen as LH is to

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Luteinizing hormone is responsible for

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A woman whose pituitary was damaged by disease can have a baby if she is given

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Continued secretion of milk is maintained by

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In a pregnant woman having prolonged labour ill pains, its childbirth has to be hastened. It is advisable to administer a hormone that can

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MSH produced by the pars intermedia of pituitary causes in lower vertebrates

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The posterior lobe of the pituitary secretes

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The increased blood pressure, decrease in the water content of urine and promotion of contraction of smooth muscles is brought about by

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Hormone oxytocin at the time to birth acts on uterus by

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Diabetes insipidus is the syndrome which results due to the

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If there is a deficiency of ADH its effect would be

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If a rat was given an injection of sodium iodide with radioactive iodine, then in which one of the following most of the iodine would be incorporated?

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 level is controlled by

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Cretinism in young children is due to lack of

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In certain areas often the table salt is iodised. This is done to prevent the development of

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Exophthalmic goitre is caused due to

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If a trace of thyroid extract is added to water containing tadpoles, it will

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Cushing's disease is caused by

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Which of the hormones is responsible for the emotional state such as fear and anger and causes rise of blood pressure and rate of heartbeat?

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Treatment with alloxan destroys the

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Which region of the pancreas in mammals secretes glucagon hormone?

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The exact structure of molecule of insulin was first reported by

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Failure of insulin production results in

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The hormone glucagon

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The source of male sex hormones is

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Androgens are secreted from

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Young boys at puberty start growing facial hairs. This is an example of

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A decrease in level of oestrogen and progesterone causes

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In human female, the implantation of fertilised egg in the uterus takes place under the influence of

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Function of relaxin hormone is to

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A male moth finds a mate by means of her

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Heredity

115 Qs

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Mendel was born in

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Mendel conducted his hybridization experiment with

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Mendel studied seven contrasting characters for his breeding experiment with Pisum Sativum, which of the following character did he not use?

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Mendel was lucky in the choice of the material of his experiments, among the following which contributed to his success are

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G. J. Mendel died in the year

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The year 1990, is highly significant for genetics due to

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Genotype means

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The physical manifestation of an organism's genes is its

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An organism with two identical alleles of a gene in a cell is called

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When an individual is having both the alleles of contrasting characters, it is said to be

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When an allele fails to express itself in generation in the presence of other allele, the former is said to be

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Alleles are

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Mendel's laws apply only when

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Which of Mendel's procedures differed from those of his predecessor and contributed most of his success?

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If a plant is heterozygous for tallness, the generation has both tall and dwarf plants. This proves the principle of

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Mendel crossed a pure white flowered recessive pea plant with a dominant pure red flowered plant. The first generation of hybrids from the cross should show

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If a couple has three daughters, what are the chances that the fourth child will be a son?

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If a heterozygous tall plant is crossed with a homozygous dwarf plant, the proportion of dwarf progeny will be_____________

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If a dihybrid pea plant, heterozygous for flower colour (red dominant over white) and seed shape (round dominant over wrinkled) under goes selfing, the types of gametes produced are

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Which genotype represents a true dihybrid condition?

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In F generation, the crossing of a homozygous tall plant with a homozygous dwarf would yield plants in the ratio of______________

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When a true breeding tall plant is crossed with a true breeding short plant and the produced is self pollinated to produce , ratio of true breeding tall and true breeding short plant in will be

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Blue eye colour in human is recessive to brown eyecolour. The expected children of a marriage between blue-eyed woman and brown-eyed male who had a blue-eyed mother are likely to be

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The cross used to ascertain whether the plant is homozygous or heterozygous is

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The genotype of an offspring is determined by crossing it with the recessive parent. This cross is called

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The results of a test cross reveal that all the offspring resemble the parent being tested. This parent must be

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Chromosome theory of heredity was postulated by

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Chromosome theory of heredity was formulated for the first time on the basis of which of the following observation?

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Continuity of germ plasm theory by Weismann was proposed in

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Which chromosome set is found in male grasshopper?

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Allosomes are

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Two bacteria found to be very useful in genetic engineering experiments are

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Mutation is

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Which one of the following mutations is not hereditary?

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Recessive mutation are expressed normally

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Some harmful mutations are not eliminated from the gene pool because 

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Which of the following is not heritable?

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Mutations are generally

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Which of the following is a mutagen?

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Mutations are usually induced by

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The plant that was made popular by "De Vries mutation theory":

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Gene mutation is caused

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Which of the following is an example of a point mutation?

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Point mutation is

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Mutations used in agriculture are

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Sex chromosomes may be found in

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Inheritance of total colour-blindness is

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Which one of the following is the sex linked character in human inheritance?

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A man is haemophiliac. This indicates that he

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Human offspring would be a normal female, if the 23 pair of chromosome in zygote is

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Genes located on Y chromosome are

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Autosomes in humans are

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Barr body is derived from

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Barr body represents

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Heterosis is

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The identical twins are born when

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Pure line selection results in retention of desired characters__________

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Down's syndrome is due to

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Which of the following have equal number of chromosomes?

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Genetic information in a DNA is coded in the

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DNA is the genetic material, was proved conclusively by

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For the structure of nucleic acid, which of the following statements is wrong?

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Watson and Crick composed the model of DNA structure in

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DNA strands are anti-parallel because of

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A short length of a DNA molecule contains 120 adenine and 120 cytosine bases. The total number of nucleotides in this DNA fragment is

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Duplication of DNA is called as

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DNA replication is

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If the base sequences of the strand of DNA is CAT TAG CAT CAT GAC, what will be base sequence of complementary RNA strand?

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Jumping genes are now known as

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DNA polymerase enzyme is required for the synthesis of 

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Which enzyme catalyses the synthesis of a new strand for a DNA molecule by linking nucleotides to the developing strand?

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In DNA replication, the Okazaki fragments on the lagging strand are joined together by

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Technique for detecting and screening the nutritional mutants in Neurospora crassa was developed by

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There are 64 codons in genetic code dictionary, because

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Genetic code was deciphered by chemically synthesizing nucleotides by

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Genetic code was discovered by

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Nirenberg used an artificial mRNA poly U (UUU...U), which gave rise to polyphenylalanine. This proved that

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Initiation of polypeptide chain in protein synthesis is induced by

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In protein synthesis, the codon used as a start signal is

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UAA, UAG and UGA are

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Termination of chain growth in protein synthesis is brought about by the codons

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Because most of the amino acids are represented by more than one codons, the genetic code is said to be

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The term degeneracy was given by

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Gene controls

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Which of following has a clover leaf shaped structure?

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Anticodon is associated with

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The process "translation" means

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Nobel Prize to A. Kornberg and S. Ochoa was given for

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Which of the following act as a genetic material for Retrovirus?

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Of the following, which sequence is present in Rous Sarcoma Virus?

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The information carried by RNA in retroviruses is put in the DNA code by

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Who coined the term gene?

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A functional unit in a gene is a

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The terms cistron, recon and muton were proposed by

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The term genome is used for

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Barbara McClintock work showed that in maize

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Which one of the following scientists, got the Nobel Prize for discovering the concept of mobile genetic elements in maize?

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Which one of the following, scientists developed the process of DNA fingerprinting?

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The recent techniques used for separating fragments of DNA is

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Which one of the following is related with genetic engineering?

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The first step in genetic engineering as

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H. Harris and J.F. Watkins in 1965 first time reported the fusion of following cell lines to form hybrids

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Term hybridoma implies

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Restriction enzymes are isolated chiefly from

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Who among the following, discovered the enzyme restriction endonuclease?

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Restriction endonucleases are utilised in genetic engineering techniques as

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Genetic engineering is used in

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The first hormone artificially produced by culturing bacteria is

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Hybridisation through protoplast fusion is known as

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Hybridisation through protoplast fusion is known as

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The transgenic animals are those that have

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Producing a 'giant mouse' in the laboratory was possible through

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Which one among the following are transgenic organisms?

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Which one of the following scientists got the Nobel Prize for his invention polymerase chain reaction (PCR)?

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Human genome contains about

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Evolution

58 Qs

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Earth originated in the past

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According to scientists, the 'big bang' occurred approximately .......... years ago.

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The scientist related with the theory of spontaneous generation and experiments with swan-necked flasks is

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Pasteur succeeded in disproving the spontaneous generation theory because

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Who said that organisms develop from preexisting organisms?

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The first organisms were

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Which one of the following gases was not present in free form at the time life originated on the earth?

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Why was the primitive atmosphere of earth more beneficial to the origin of life than the modern atmosphere of earth?

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The simple organic compounds that may have first evolved in the direction of origin of life on earth may have been

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Russian scientist who proposed the theory of origin of life was

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Stanley Miller conducted an experiment to demonstrate that simple organic molecules like amino acids could be produced if an electric discharge is passed through a mixture of such gases as might have been present in the atmosphere of early earth. The gaseous mixture he used in the experiment were

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In their laboratory simulation of early earth, Miller and Urey observed the abiotic synthesis of

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The first genetic material was most likely

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The richest source of fossils is

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Study of fossils is known as

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Biologists who study the sequences of organisms in the fossil record are

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Famous palaeobotanist of India was

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Fossils are now date by

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Which were dominant in mesozoic?

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Dinosaurs were abundant in

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The "golden age of reptiles" was

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Palaeontological evidence in favour of organic evolution is beautifully illustrated by

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The fossil remains of Archaeopteryx is a connecting link between

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Which one of the following animals exhibits characters as 'connecting link' of evolution?

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Which of the following set is the evidence of evolution?

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Homologous structures have

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Of the following anatomical structures, which is homologous to the wing of a bat?

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Analogous organs have a

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Which one of the following sets of structures includes only analogous organs?

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Which of the following is an example of analogy?

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Which of the following set represents all vestigial structures in the human body?

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Which of the following is a vestigial organ in the human body?

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The earliest animal to have been domesticated by man was most likely the

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The essence of Haeckel's recapitulation theory is

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Presence of gill slits in the embryo of all vertebrates supports the theory of

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Biogenetic law was propounded by

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Appearance of ancestral characters in the new borne, such as tail, multiple mammae, etc., are known as

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Which animal faced extinction recently?

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Evolution is defined as

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Lamarck belongs to

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The book named "Philosophic Zoologique" was published in 1809 and was written by

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Theory of inheritance of acquired characters was put forth by

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Penguin is a bird that lost the use of its wings by not flying. Such a statement would express the views of

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Germ plasm theory was given by

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A scientist kept 80 generations of Drosophila in darkness, even after that the flies had normal eyes. This disapproves law of

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The biggest opponent of Lamarck was

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Weismann cut off tails of mice generation after generation but tails neither disappeared nor shortened showing that

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Basic idea of organic evolution is

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What did Charles Darwin publish in 1859?

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All of the following influenced Darwin as he synthesised the concept of natural selection except

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The book 'Descent of Man and Selection in Relation to Sex' was written by

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The Galapagos islands are associated with the visit of

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Darwin worked on Galapagos finches. The number of species of these finches is

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Which of the following was most influential upon Darwin's formulation of theory of natural selection?

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Which one of the following evolutionists proposed the theory of evolution similar to Charles Darwin's?

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'Survival of the fittest' was used by

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The ultimate source of organic variation is

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After observing the variations Hugo De Vries first of all described the mutation in

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MCQ

105 Qs

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In which of the following plants vegetative reproduction takes place with the help of bulbils?

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Scion is a term in relation to

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Which of the following is propagated by means of cuttings?

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Stem cuttings are commonly used for propagation in

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A method in which roots are induced on the stem while it is still attached to the parent plant is called

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During grafting rootstock is generally derived from a plant

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Clones are

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What is parthenogenesis?

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What is micropropagation?

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A clone is a group of individuals obtained through______________

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Which one of the following is the true definition of totipotent cell?

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Cellular totipotency was for the first time demonstrated by

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The combination of auxin and cytokinin, which is likely to induce shoot differentiation in tobacco callus is

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After culturing the anther of a plant, a few diploid plants were got along with haploid plants. Which of the following parts might have given rise to diploid plants?

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Pollination is best defined as?

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Pollination is a characteristic of

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Self-pollination means _____________.

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When pollen of a flower is transferred to the stigma of another flower of the same plant the pollination is referred to as

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Cross-pollination is advantageous because it results in

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The allogamy is best favoured by

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In same flowers, the stamens and pistil reach maturity at the same time. It is known as

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How is pollination brought about in maize?

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Pollination by bats is called as

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Hydrophily is best demonstrated by

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Entomophily is pollination by

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Insect pollinated flowers usually possess

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Flowers which are pollinated by insects are

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The chief pollinators of our agri-horticultural crops are

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Lever mechanism for pollination is characteristic feature of

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A very close relationship between flower and pollinating agent is best exhibited by

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In Salvia, the pollination is affected by

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In Ficus religiosa (peepal), the pollination is affected by

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The insect Blastophaga grossorum is associated with the pollination of

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Which of the following terms describes pollination by the agency of ants?

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What is emasculation?

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In angiosperms, meiosis occurs when

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One of the most resistant biological materials known is

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How many pollen mother cells will produce 1000 pollen grains?

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In angiosperms, how many microspore mother cells are required to produce 100 pollen grains?

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Generally the number of integuments in the ovule of angiosperms and gymnosperms is

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When the hilum, chalaza and micropyle of the ovule lie in the same longitudinal axis, it is known as

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Fertilization means

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Which of the following event is not directly affected by light in a vegetable garden?

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External water is not essential for fertilisation in

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Fertilisation in which male gametes are carried through pollen tube is known as

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Double fertilisation is characteristic of

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One of the essential organs for fertilisation is

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Double fertilisation means

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Syngamy refers to

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Milky water of green coconut is

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Morphologically the white fluffy edible mass in maize is

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The megasporangium of the angiosperms on maturation gives rise to

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Seeds are called as products of sexual reproduction because they:

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Collar like outgrowth arising from the base of ovule and forming a sort of third integument is known as

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In coconut brown covering (thin layer) adherent to the kernel around the endosperm is

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Which one is primary sex organ?

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In a human male, the testes are located in the

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The testes are abdominal in

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Testes are masses of coiled

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In the case of mammals testes, extra abdominal situated in scrotal sacs because

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Failure of descending testis into the scrotum is known as

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Sperms are produced in the

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Mature sperms are stored in the

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Which of the following is an accessory reproductive gland in male mammals?

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Which one of the following is found in the human female but not in the male?

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Each ejaculate of a man contains about how many sperm?

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Testosterone is secreted by which endocrine part of testis?

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Testosterone, the male sex hormone is synthesised in the

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The abdominal passage, which connects the abdominal cavity with the scrotal sac in mammals is known as

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Graafian follicle are characteristically found in the

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When a mature egg leaves the ovary, it enters the

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Fertilisation takes place in the

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In female mammal, insemination occurs in

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The hormone responsible for inducing spermatogenesis and oogenesis is

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Spermatozoa are nourished during their development by

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Number of spermatozoa, a single primary spermatocyte ultimately produced in spermatogenesis is

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The sperm produces substances of enzymatic nature of sperm lysins. In mammals, it is known as 

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Fertilizins are the substances secreted from

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Rupturing of follicles and discharge of ova is known as

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The hormone that is present in greatest concentration during the time of ovulation in a female is

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How many mature eggs do each ovary of a non-pregnant woman typically produce each year?

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The oestrous or menstrual cycle begins with a breaking down of the womb wall. The ovum or egg is released

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In 28-day human ovarian cycle, ovulation occurs on

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After ovulation, endocrine part of ovary is

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Which of the following hormones maintains the integrity of the uterine wall during pregnancy?

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During pregnancy, the production of ova in ovary is prevented by

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Menstruation is triggered by an abrupt decline in the amount of

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The menstrual cycle in mammals is accomplished with the help of

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Menopause is the stage in human female when

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In human female, the fertilised egg gets implantat in uterus

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The limited period of sexual receptive that occurs around the time of ovulation in all female mammals except humans is called as

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Monoestrous animals have

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Gestation period is the duration

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Mammalian egg contains negligible yolk so the survival of such embryo is made possible by the fact that they are

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The expulsion of completely developed foetus from the uterus is known as

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In pregnant woman having prolonged labour pains, if the childbirth has to be hastened, it is advisable to administer a hormone that can

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Contraceptive oral pills help in birth control by

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What would happen if vas efferentia of man were cut?

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The fertilisation cone, which pulls the sperm into the egg, is formed from

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After a sperm has penetrated an ovum in the process of fertilisation, entry of further sperms is prevented by

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Natural parthenogenesis occurs in

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Placenta is the region, where

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Placenta in human is

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For a few days after delivery, the mammary glands of human females secrete a highly nutritive fluid, which is known as

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Copper-T is a device that prevents

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