Question

Refer to the given figure of human digestive system and select the correct statements regarding parts labelled P, Q, R and S.



i. P and R secrete and pour their digestive enzymes in Q for digestion whereas Q secretes HCl which kills germs in food.
ii. Digestion of both carbohydrates and proteins takes place in Q whereas digestion of only fats takes place in S.
iii. Q, R and S secrete digestive enzymes, but P only stores a digestive juice that emulsifies fats.
iv. S does not secrete any digestive enzymes but receives digestive enzymes of P, Q and R for complete digestion
of food.
v. If P is removed in a person, then he cannot digest fats present in his food.
vi. Q secretes digestive enzymes and mucus whereas R secretes digestive enzymes and hormones.

• A. (ii), (iv) and (v) only
• B. (iii) and (vi) only
• C. (iv), (v) and (vi) only
• D. (i), (iii) and (v) only

Answer 1

The correct option is B (iii) and (vi) only

• In statement (i), P that is gallbladder and R that is pancreas secrete their digestive enzymes in Q that is stomach. This is incorrect.
• Statement (ii): Digestion of carbohydrate and protein takes place in Q. Q is the stomach and this statement is also incorrect.
• Statement (iii): Q, R and S that is stomach, pancreas and small intestine secrete digestive enzymes and P that is gallbladder store bile juice which makes this statement correct.
• Statement (iv): S that is the small intestine does secrete digestive enzymes which makes this statement incorrect.
• Statement (v): If P that is gallbladder is removed, then bile juice can’t be stored, however, fats can still be digested as bile juice is secreted by the liver. Therefore, even this statement is incorrect.
• Statement (vi): Q is stomach and it secretes pepsin and mucus. R is a pancreas which also secretes different digestive enzymes. Thus, this statement is correct.