Please refer to Digestion and Absorption Class 11 Biology Important Questions with answers below. These solved questions for Chapter 16 Digestion and Absorption in NCERT Book for Class 11 Biology have been prepared based on the latest syllabus and examination guidelines issued by CBSE, NCERT, and KVS. Students should learn these solved problems properly as these will help them to get better marks in your class tests and examinations. You will also be able to understand how to write answers properly. Revise these questions and answers regularly. We have provided Notes for Class 11 Biology for all chapters in your textbooks.

Important Questions Class 11 Biology Chapter 16 Digestion and Absorption

Objective Questions

Question. Most of the fat digestion occurs in
(a) rectum
(b) stomach
(c) colon
(d) small intestine

Question. Enterokinase takes part in conversion of
(a) pepsinogen to pepsin
(b) trypsinogen to trypsin
(c) protein into polypeptides
(d) caseinogen into casein

Question. Rennin acts on milk protein and changes
(a) caesinogen into caesin.
(b) caesin into paracaesin.
(c) caseinogen into paracaesin.
(d) paracaesin into caesinogen.

Question. Which enzyme initiates protein digestion ?
(a) Pepsin
(b) Trypsin
(c) Aminopeptidase
(d) Carboxypeptidase

Question. Most of the chemical digestion of food in humans is completed in the —
(a) small intestine
(b) appendix
(c) ascending colon
(d) stomach

Question. End product of protein digestion is —
(a) sugar
(b) amino acid
(c) nucleotide
(d) ammonia

Question. Which one of the following is the constituents of the pancreatic juice while poured into the duodenum in humans?
(a) Maltase
(b) Enterokinase
(c) Trypsinogen
(d) Chymotrypsin

Question. Diglycerides on digestion give
(a) one fatty acid and one glycerol
(b) two fatty acid and one glycerol
(c) two glycerol and one fatty acid
(d) two glycerols only

Question. Which of the following enzyme is not present in pancreatic juice?
(a) Chymotrypsinogen
(b) Steapsin
(c) Nuclease
(d) Enterokinase

Question. Protection of the walls of the stomach against the action of its own digestive juice
(a) is controlled by a centre in the medulla of the brain.
(b) results from the nervous reactions of the lining of the stomach.
(c) results from the presence of an anti-enzyme chemical formed by the gastric gland.
(d) results from the neutralizing, buffering and coating mucus covering its inner surface.

Question. Glucose, some amino acids and sodium are absorbed in to blood by ________.
(a) simple diffusion
(b) active transport
(c) facilitated transport
(d) the statement is incorrect since they are absorbed in lymph and not in blood.

Question. The main function of lacteals in the villi of small intestine is the absorption of
(a) amino acids and glucose
(b) glucose and vitamins
(c) water and mineral salts
(d) fatty acids and glycerol

Question. Jaundice may be caused by retarded function of —
(a) lungs
(b) kidneys
(c) heart
(d) liver

Assertion/Reason Type Questions

In the following questions, a statement of Assertion is followed by a statement of Reason.
(a) If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
(b) If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.
(c) If Assertion is true but Reason is false.
(d) If both Assertion and Reason are false.

Question. Assertion : Presence of HCl in stomach is essential for the process of digestion.
Reason : HCl kills and inhibits the growth of bacteria in stomach.

Question. Assertion : Glucose, Na⁺ and amino acids are absorbed actively.
Reason : Na⁺, glucose and amino acids move against the concentration gradient and hence require energy.

Critical Thinking Type Questions

Question. If the bile-pancreatic duct is blocked then which of the following will not be affected ?
(a) Digestion of proteins
(b) Emulsification of fats
(c) Level of blood glucose
(d) Digestion of starch

Question. Which of the following occurs in the duodenum?
(a) Absorption of vitamins and minerals.
(b) Mixing of food with pancreatic juice and bile.
(c) Mastication of food.
(d) Absorption of water.

Question. If for some reason our goblet cells becomes nonfunctional then this will adversely affect
(a) production of somatostatin.
(b) secretion of sebum from the sebaceous glands.
(c) maturation of sperms.
(d) smooth movement of food down the intestine.

Question. Removal of gall bladder in man would lead to
(a) impairment of digestion of fats.
(b) impairment of digestion of protein.
(c) jaundice
(d) increased acidity in intestine.

Question. A healthy person eats the following diet – 5 gm raw sugar, 4 gm albumin, 10 gm pure buffalo ghee adultrated with 2 gm vegetable ghee (hydrogenated vegetable oil) and 5 gm lignin. How many calories he is likely to get?
(a) 144
(b) 126
(c) 164
(d) 112

Question. In case of taking food rich in lime juice, the action of ptyalin on starch is
(a) enhanced
(b) reduced
(c) unaffected
(d) stopped

Question. An adolescent human below 17 years of age normally has dental formula as
(a) 2, 1, 2, 0/2, 1, 2, 0
(b) 2,1, 2, 2/2,1, 2, 2
(c) 2,1, 3, 2/ 2,1, 3, 2
(d) 2, 2, 3, 2/2, 2, 3, 2

Question. What will happen if the secretion of parietal cells of gastric glands is blocked with an inhibitor?
(a) Enterokinase will not be released from the duodenal mucosa and so trypsinogen is not converted into
trypsin.
(b) Gastric juice will be deficient in chymosin.
(c) Gastric juice will be deficient in pepsinogen.
(d) In the absence of HCl secretion, inactive pepsinogen is not converted into the active enzyme pepsin.

Question. A person who is on hunger strike and is surviving only on water, will have
(a) less amino acids in his urine.
(b) more glucose in his blood.
(c) less urea in his urine.
(d) more sodium in his urine.