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Standard XII
Biology
Question

Study the four statements (A-D) given below and select the two correct ones out of them. The two correct statements are
A.Biological species concept was given by Ernst Mayr.
BPhotoperiod does not affect reproduction in plants.
C.Binomial nomenclature system was given by R. H. Whittaker.
D.In unicellular organisms, reproduction is synonymous with growth.

  1. A and B
  2. A and D
  3. B and C
  4. C and D

A
A and B
B
A and D
C
B and C
D
C and D
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Solution
Verified by Toppr

The biological species concept, as first proposed by Mayr, groups the members of the same species organisms that can potentially interbreed to produce fertile offspring. Photoperiod is the relative length of day to night which is required to induce flowering and flowers are the organs of sexual reproduction in plants. Linnaeus is considered the father of taxonomy and was first to use the binomial nomenclature for organisms. Unicellular organisms reproduce by cell division making the growth synonymous with reproduction. Statement A and D are correct. Hence, option A is the correct answer.

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Similar Questions
Q1
Study the four statements, a-d, given below and select the two correct ones out of them.
(a) Definition of biological species was given by Ernst Mayr.
(b) Photoperiod does not affect reproduction in plants.
(c) Binomial nomenclature system was given by R.H. Whittaker.
(d) In unicellular organisms reproduction is synonymous with growth.
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Q2
Read the given statements.
(a) .............. are collectively called .............. as all of these are seedless plants and have inconspicuous reproductive organs.
(b) .............. are collectively called ................... as they are seeded plants and possess conspicuous reproductive organs.
(c) The scientific nomenclature of organisms used today was developed by ............ and consists of ................ and species name.
(d) Class Aves consists of ................. animals while class Reptilia consists of ................ animals.
Select the option which correctly fills the blanks in any two of the above statements.

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Q3
Study the four statements (a–d) given below and select two correct ones out of them:

1. A lion eating a deer and a sparrow feeding on grain are ecologically similar in being consumers

2. Predator starfish Pisaster helps in maintaining species diversity of some invertebrates

3. Predators ultimately lead to the extinction of prey species


4. Production of chemicals such as nicotine, strychnine by the plants are metabolic disorders

The two correct statements are
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Q4
Consider the following statements with respect to reproduction in the lower living organisms
(a) Organisms like yeast and Planaria reproduce asexually by means of budding
(b) True regeneration is observed in Hydra
(c) Protonema of mosses multiply by fragmentation
(d) In unicellular organisms like bacteria, algae, and Amoeba, reproduction is synonymous with growth, i.e., an increase in the number of cells.

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Q5

A few statements with regard to sexual reproduction are given below
i. Sexual reproduction does not always require two individuals
ii Sexual reproduction generally involves gametic fusion
iii Meiosis never occurs during sexual reproduction
iv External fertilisation is a rule during sexual reproduction
Choose the correct statements from the options below:
(a) i and iv, (b) i and ii
(c) ii and iii (d) i and iv

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