Question 1

In the wall of the alimentary canal, what is the correct sequence of layers, starting from the outside to the inside?

Accepted Answer

The alimentary canal walls have four basic tunics or layers. The outermost one is the serosa which is a thin membranous covering. Inner to serosa is the muscle layer of outer longitudinal muscles and the inner layer of circular&#10;muscles.Then&#10;there is&#10;submucosa which is then followed by the innermost layer of mucosa. The mucosa is the epithelial membrane lining the lumen of the alimentary canal.So, the correct answer is (C).

Question 2

In mammals, the digestion of starch starts from

Accepted Answer

In mouth cavity, food is chewed to break them into smaller particles. Saliva secreted from salivary gland contains an enzyme called salivary amylase or ptyalin. Carbohydrate digestion starts in the buccal cavity by amylase. The gradual degradation of carbohydrate or starch occurs by the action of amylase on the glycosidic linkages in the polysaccharide.

Question 3

Muscles of alimentary canal are chiefly _______________.

Accepted Answer

The alimentary canal is made up of smooth muscles which are involuntary and controlled by the autonomic nervous system. Single-unit smooth muscles are present in the alimentary canal and they can contract regularly without input from a motor neuron (myogenic) as opposed to multi-unit smooth muscle, which is neurogenic - that is, its contraction must be initiated by an autonomic nervous system neuron (neurogenic).Hence, muscles of the alimentary canal are chiefly unstriated and myogenic.So the correct answer is option D.

Question 4

Pulp cavity of teeth is lined by

Accepted Answer

Odontoblasts are the dentine forming cells, derived from mesenchyme of neural crest origin, lining the pulp cavity of a tooth. Odontoblasts are arranged in a peripheral layer in the dental pulp.

Question 5

Taste buds for bitter taste are found on tongue at

Accepted Answer

The four basic kinds of tastes are: sweet, salty, sour and bitter. The salty/sweet taste buds are located near the front of the tongue.The sour taste buds line the sides of the tongue.Bitter taste buds are found at the back of the tongue. The centre of the tongue has few taste buds. So, the correct answer is 'Posterior part'.

Question 6

Which one of the following is not a mammalian character?

Accepted Answer

The presence of milk-producing glands (mammary glands), external and middle ears, two pairs of limbs, and skin with hair are some of the characteristic features of mammals. Most vertebrates, except mammals, have homodont teeth (anatomically and functionally similar teeth) while mammals possess heterodont teeth (different types of teeth with different functions). Thus, the correct answer is option E.

Question 7

The columnar epithelium lining the intestinal mucosa appears to have a brush like an appearance.

Accepted Answer

A large number of microvilli are present on brush bordered columnar epithelium.

Question 8

The wall of rectum lacks

Accepted Answer

Taeniae are the longitudinal ribbons composed of smooth muscles and are present in ascending transverse, descending and sigmoid colons. These taeniae then contact to produce haustra which are bulges of the colon. These taeniae spread out and unit to form longitudinal muscle layer. Thus, the correct answer is option D.

Question 9

In rabbit, the digestion of cellulose takes place in

Accepted Answer

The cecum is a blind sac or pouch, that is present at the junction of the small and large intestines. The food material that can be broken down further, mainly soluble fiber and proteins, moves into the cecum. The cecum has 10 times the capacity of the stomach of the rabbit. Here massive quantities of bacteria and microorganisms reside. The bacteria turn the indigestible fiber into digestible nutrients which are directly absorbed across the wall of the cecum for use by the animal, while others are excreted.

Question 10

Digestive enzymes are

Accepted Answer

Correct option: AExplanation: Digestive enzymes are Hydrolase. They catalyze the hydrolysis of proteins, nucleic acids, starch and fats.Digestive enzymes break down macromolecules into their smaller molecules. Example- Amylases break down carbohydrates into simple sugars. Protein break down into small peptides and amino acids by proteases. Lipases break down fats into three fatty acids and glycerol. Oxidoreductase catalyzes the transfer of electrons from one molecule, the reductant or electron donor to oxidant or electron acceptor.Transferase catalyze the transfer of a functional group from donor to a receptor.Thus, All digestive enzymes are hydrolase. Option A is correct.

Digestion And Absorption

Biology
7899 Views

In the wall of the alimentary canal, what is the correct sequence of layers, starting from the outside to the inside?

In mammals, the digestion of starch starts from

Muscles of alimentary canal are chiefly _______________.

Pulp cavity of teeth is lined by

Taste buds for bitter taste are found on tongue at

Which one of the following is not a mammalian character?

The columnar epithelium lining the intestinal mucosa appears to have a brush like an appearance.

A large number of microvilli are present on brush bordered columnar epithelium.

The wall of rectum lacks

In rabbit, the digestion of cellulose takes place in

Digestive enzymes are

Digestion And Absorption

Biology 7899 Views

In the wall of the alimentary canal, what is the correct sequence of layers, starting from the outside to the inside?

In mammals, the digestion of starch starts from

Muscles of alimentary canal are chiefly _______________.

Pulp cavity of teeth is lined by

Taste buds for bitter taste are found on tongue at

Which one of the following is not a mammalian character?

The columnar epithelium lining the intestinal mucosa appears to have a brush like an appearance.

A large number of microvilli are present on brush bordered columnar epithelium.

The wall of rectum lacks

In rabbit, the digestion of cellulose takes place in

Digestive enzymes are

Biology
7899 Views