Answer briefly :(A) Why are villi present in the intestine and not in the stomach? (B)How does pepsinogen change into its active form? (C)What are the basis layer of the wall of alimentary canal? (D) How does bile help in the digestion of fats?

Answer briefly: (a) Why are villi present in the intestine and not in the stomach? (b) How does pepsinogen change into its active form? (c) What are the basic layers of the wall of alimentary canal? (d) How does bile help in the digestion of fats?

Given below are assertion and reason. Point out if both are correct with reason being correct explanation (A), both true but reason is not correct explanation (B), assertion true but reason is wrong (C), both are wrong (D). Assertion. Thick layers of muscles are present in the wall of alimentary canal. Reason. These muscles help in mixing of food materials with enzymes coming from glands of alimentary canal.Â

Answer briefly : (a) How do you perceive the colour of an object ? (b) Which part of our body helps us in maintaining the body balance ? (c) How does the eye regulate the amount of light that falls on the retina.

(a)What is bile? (b) How does gall bladder bile differ from liver bile? (c) Does bile contaion any enzyme?

Potassium crystallises in a bcc lattice as shown in figure : (a) What is the distance the nearest neighbours ? (b) What is the distance between the next nearest neighbours ? (c) How many nearest neighbours does each potassium atom have ? (d) How many next nearest neighbours does each potassium atom have ?

(a) Name the chief proteins in milk. (b) How does milk coagulate? (c) What is the product of milkcoagulation? (d) Why milk is not considered as balanced food of adults?