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NEET • BIOLOGY • DIGESTION AND ABSORPTION

Digestion and absorption practice · Mixed difficulty

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1 Medium

1 of 255

Understanding +4 | -1

In the Absence of enterokinase, the digestion of ………… would be affected in our intestine.

View answer and explanation

Correct option: C

Albumin

Option C (Albumin) is correct because enterokinase activates trypsinogen to trypsin, which is essential for the digestion of proteins like albumin.

2 Easy

2 of 255

Understanding +4 | -1

In the following gastrointestinal disorder, bowel movements occur irregularly and the faeces are retained within the colon

View answer and explanation

Correct option: D

Constipation

Option D (Constipation) is correct because constipation is characterized by infrequent bowel movements and the retention of feces within the colon, leading to hard and difficult-to-pass stools.

3 Hard

3 of 255

Analyzing +4 | -1

Go through the following statements regarding the absorption of nutrients. Identify wheather they are true or false then choose the correct option accordingly
I. Absorption of monosaccharides, alcohol, some water and medicines like asprin occurs in the stomach
II. Fatty acids cannot be absorbed directly
III. Glycerol can reach into the blood and lymph directly
IV. Maximum absorption of water (90%) takes place in the small intestine
V. Large intestine and mouth are not the site of absorption

View answer and explanation

Correct option: A

I, II and IV are true while III and V are false

Option A is correct because statements I, II, and IV are true regarding nutrient absorption, while statements III and V are false.

4 Hard

4 of 255

Remembering +4 | -1

Which one of the following is antioxidant vitamin?

View answer and explanation

Correct option: A

C, E and A

Option A (C, E and A) is correct because Vitamins C, E, and A are known for their antioxidant properties, protecting cells from damage caused by free radicals.

5 Hard

5 of 255

Remembering +4 | -1

Deficiency of which essential amino acid leads to deregulation of blood sugar?

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Correct option: A

Isoleucine

Option A (Isoleucine) is correct because isoleucine is an essential amino acid that plays a role in glucose metabolism, and its deficiency can lead to deregulation of blood sugar levels.

6 Easy

6 of 255

Remembering +4 | -1

Which of the following is the constituent of pancreatic juices?

View answer and explanation

Correct option: A

Sodium bicarbonate and three proenzymes

The correct answer is A (Sodium bicarbonate and three proenzymes) because pancreatic juice contains sodium bicarbonate to neutralize stomach acid and three major proenzymes: trypsinogen, chymotrypsinogen, and procarboxypeptidase.

7 Medium

7 of 255

Remembering +4 | -1

Crypts of Leiberkuhn are example for

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Correct option: A

Simple tubular gland

Option A (Simple tubular gland) is correct because Crypts of Lieberkühn are simple, tube-shaped glands found in the intestinal lining.

8 Hard

8 of 255

Understanding +4 | -1

Assertion: Pavlov has improtant contribution in study of digestion.

Reason: Pavlov discovered that salivation occurs when food is placed in front of us.

View answer and explanation

Correct option: D

If both the Assertion and Reason are incorrect

Option C (If Assertion is correct but Reason is incorrect) is correct because Pavlov did have important contributions to the study of digestion, but the reason is incorrect as Pavlov discovered conditioned reflexes, not just salivation when food is placed in front of us.

9 Hard

9 of 255

Analyzing +4 | -1

Identify wheather the given statements are true or false in the context of deficiency of essential amino acids and choose the correct option accordingly
I. Incomplete break down of proteins in the digestive system
II. Deregulation of mood and sleep
III. Increased production of sulphur
IV. Decreased amount of niacin

View answer and explanation

Correct option: A

I – True
II – True
III – False
IV – True

Option A is correct because incomplete protein breakdown, mood and sleep deregulation, and decreased niacin levels are all associated with essential amino acid deficiencies, while increased sulfur production is not.

10 Medium

10 of 255

Remembering +4 | -1

Which of the following metals is present in vitamin-

{B_{12}}

View answer and explanation

Correct option: A

Cobalt

Option A (Cobalt) is correct because vitamin B12 (cobalamin) contains cobalt as a central component of its structure.

11 Hard

11 of 255

Remembering +4 | -1

Glisson's capsules are found in:

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Correct option: B

Liver of mammals

Option B (Liver of mammals) is correct because Glisson's capsules are a fibrous capsule that surrounds the liver in mammals.

12 Easy

12 of 255

Remembering +4 | -1

The essential vitamin for blood coagulation is

View answer and explanation

Correct option: C

Vitamin-K

Option C (Vitamin-K) is correct because Vitamin K is essential for the synthesis of clotting factors in the blood, which are necessary for blood coagulation.

13 Hard

13 of 255

Application +4 | -1

A person consumes

20 \,\mathrm{~g}

of roasted potato chips,

25\, \mathrm{~g}

of bread with

15\, \mathrm{~g}

of butter and

150 \mathrm{~g}

of proteins. What is his approximate total calorie intake?

View answer and explanation

Correct option: A

915 \, \mathrm{kcal}

Option A (915 kcal) is correct because it accurately calculates the total calorie intake based on the given amounts of carbohydrates, fats, and proteins.

14 Easy

14 of 255

Understanding +4 | -1

In human body, the role of bile salts in digestion is to

View answer and explanation

Correct option: B

Emulsify fats and facilitate their absorption

Option B (Emulsify fats and facilitate their absorption) is correct because bile salts break down large fat globules into smaller droplets, increasing the surface area for lipase to act and facilitating absorption.

15 Medium

15 of 255

Understanding +4 | -1

Read the statement A and B. A. In human, small intestine is the longest portion of the alimentary canal. B. Absorption of digested food requires a very large surface area. Identify the correct choice on the two statements.

View answer and explanation

Correct option: B

Statement A and B are both correct

Option B (Statement A and B are both correct) is correct because the small intestine is the longest part of the alimentary canal, and its large surface area is essential for absorption.

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16 Easy

16 of 255

Understanding +4 | -1

The pH of the digestive juices within the human small intestine is between 7.5 and 8.5. This environment is slightly

View answer and explanation

Correct option: A

Basic

Option A (Basic) is correct because a pH between 7.5 and 8.5 is above 7, indicating a basic or alkaline environment.

17 Medium

17 of 255

Remembering +4 | -1

Which of the following is/are the major components of food?

View answer and explanation

Correct option: D

All of these

Option D (All of these) is correct because proteins, cereals, and fats are all major components of food.

18 Medium

18 of 255

Understanding +4 | -1

Drowsiness after a heavy meal occurs due to

View answer and explanation

Correct option: C

Reduced blood pressure in the brain

Option C (Reduced blood pressure in the brain) is correct because digestion requires increased blood flow to the digestive system, potentially reducing blood flow to the brain.

19 Hard

19 of 255

Application +4 | -1

A healthy person eats the following diet which constitutes of 10 gm raw sugar, 2 gm albumin, 20 gm lignin, 10 gm pure buffalo ghee. How many calories he is likely to get?

View answer and explanation

Correct option: A

138

Option A (138) is correct because the calculation involves multiplying the grams of each food type by its caloric value (sugar and albumin: 4 kcal/g, ghee: 9 kcal/g) and summing them up. Lignin is indigestible.

20 Medium

20 of 255

Understanding +4 | -1

Assertion (A): The type of Human Dentition are called heterodont.
Reason (R): An adult human has 32 permanent teeth which are of four different types

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Correct option: D

Both (A) and (R) are true and (R) is the correct explanation of (A)

Option D (Both (A) and (R) are true and (R) is the correct explanation of (A)) is correct because heterodont dentition refers to having different types of teeth, and humans have 32 teeth of four different types (incisors, canines, premolars, and molars).

21 Easy

21 of 255

Remembering +4 | -1

The best source of vitamin-

{B_1}

View answer and explanation

Correct option: A

Whole Wheat bread

Option A (Whole Wheat bread) is correct as it is a rich source of vitamin B1 (Thiamine).

22 Hard

22 of 255

Remembering +4 | -1

The true stomach in ruminants, Where most of digestion takes place is

View answer and explanation

Correct option: D

Abomasum

The correct answer is D (Abomasum) because the abomasum is the true stomach in ruminants, secreting gastric juices and enzymes for digestion, similar to the monogastric stomach.

23 Easy

23 of 255

Remembering +4 | -1

Submaxillary glands of rabbit pour their secretions through

View answer and explanation

Correct option: C

Wharton’s duct

Option C is correct because the submaxillary glands (also known as submandibular glands) in rabbits, like in many mammals, release their secretions through Wharton's duct.

24 Medium

24 of 255

Analyzing +4 | -1

Assertion: Fat is restricted in the diet of a person
who has undergone an operation to remove gall
bladder.

Reason: Gall bladder stores lipases which are
released in small intestine for digestion.

View answer and explanation

Correct option: C

If Assertion is true but Reason is false

Option C (If Assertion is true but Reason is false) is correct because fat is restricted in the diet after gallbladder removal, but the gallbladder stores bile, not lipases.

25 Hard

25 of 255

Understanding +4 | -1

Choose true and false statements regarding the  pancreaticdigestive glands of humans I. It is a compound gland as it posseses both exocrine and endocrine parts II. Exocrine parts secretes alkaline pancreatic juices III. Endocrine part secretes hormones like insulin and glucagon IV. They are surrounded by glisson’s capsule V. Secretion of these gland’s forms gastric juices Pick the correct option accordingly

View answer and explanation

Correct option: A

I, II, III are true while IV and V are false

Option A (I, II, III are true while IV and V are false) is correct because the pancreas has both exocrine and endocrine functions, secretes alkaline pancreatic juice, and hormones like insulin and glucagon, but is not surrounded by Glisson's capsule and its secretions don't form gastric juices.

26 Medium

26 of 255

Understanding +4 | -1

In the homeostatic control of blood sugar level, which organs function respectively as modulator and effector?

View answer and explanation

Correct option: A

Liver and islets of Langerhans

Option B (Hypothalamus and liver) is correct because the hypothalamus acts as the modulator by sensing blood sugar levels, and the liver acts as the effector by releasing or storing glucose.

27 Medium

27 of 255

Analyzing +4 | -1

Assertion : Diarrhoea is the abnormal frequent
movement of bowel and increased liquidity of
faeces that may be caused by microorganisms,
stress and milk sugar intolerance.

Reason : Mild diarrhoea is caused by taking
active trophozoites deposited on the food items
by files. Causal parasite is Trichomonas
hominis of large intestine. Chyme passes
rapidly through the small intestine and faeces
in the large intestine. So, there is not enough
time for the absorption of water and electrolytes
by colon.

View answer and explanation

Correct option: A

If both Assertion and Reason are true and
Reason is the correct explanation of Assertion

Option A (If both Assertion and Reason are true and Reason is the correct explanation of Assertion) is correct because the reason explains the mechanism by which microorganisms, stress, or milk sugar intolerance can lead to diarrhea.

28 Medium

28 of 255

Remembering +4 | -1

Digestive enzymes are

View answer and explanation

Correct option: A

Hydrolases

The correct answer is A (Hydrolases) because digestive enzymes catalyze hydrolysis reactions, breaking down complex molecules by adding water.

29 Medium

29 of 255

Understanding +4 | -1

Which one is correct regarding the number of teeth and dental formula with reference to a child of age between 4 to 6 years?

View answer and explanation

Correct option: A

\frac{{2102}}{{2012}} \times 2 = 20

Option A (

\frac{{2102}}{{2012}} \times 2 = 20

) is correct because it represents the dental formula of a child aged 4-6 years, accounting for the absence of premolars.

30 Easy

30 of 255

Understanding +4 | -1

All of the following are true of secretions from the salivary glands, except that they

View answer and explanation

Correct option: D

contain enzymes for the digestion of simple sugars

Option D (contain enzymes for the digestion of simple sugars) is correct because salivary glands contain amylase for complex carbohydrates, not enzymes for simple sugars.

Revision notes and key takeaways

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Key Takeaways

✓ This set contains 255 single-correct-answer MCQs on DIGESTION AND ABSORPTION.
✓ Try each question before opening its answer. Read the explanation where one is available.
✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.

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