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NEET • BIOLOGY • DIGESTION AND ABSORPTION

Digestion and absorption practice · Mixed difficulty

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151 Hard

151 of 255

Understanding +4 | -1

Choose a proteolytic enzyme that does not act on consumed/dietary proteins or their break down products in human.

View answer and explanation

Correct option: C

Enterokinase

Option C (Enterokinase) is correct because enterokinase activates trypsinogen to trypsin, which then activates other proteolytic enzymes; it doesn't directly act on dietary proteins.

152 Medium

152 of 255

Remembering +4 | -1

Which of the following vitamins is water soluble as well as an antioxidant?

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Correct option: D

Vitamin-C

Option D (Vitamin-C) is correct because Vitamin C is both water-soluble and an antioxidant.

153 Hard

153 of 255

Remembering +4 | -1

In which of the following organ, putrefying bacteria are present?

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Correct option: A

Intestine

Option A (Intestine) is correct because the intestine, particularly the colon, harbors a large population of putrefying bacteria.

154 Hard

154 of 255

Analyzing +4 | -1

Go through the following statements regarding Oryctolagus and select the correct option
I. Denition is heterodont
II. Canines are absent
III. Herbivorous and diastema is present
IV. Incisors are chisel like and poorly developed
V. The dental formula is 2033/1023

View answer and explanation

Correct option: C

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

Option A is correct because Oryctolagus (rabbit) has heterodont dentition, lacks canines, is herbivorous with a diastema, incisors are well-developed, and the dental formula is 2033/1023.

155 Hard

155 of 255

Understanding +4 | -1

Assertion: Mucous glands occur throughout the alimentary canal.

Reason: Mucous facilitates movement of food through the alimentary canal.

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Correct option: D

Both Assertion and Reason are correct and Reason is the correct explanation of Assertion

Option D is correct because mucous glands are present throughout the alimentary canal, and their secretion facilitates food movement.

156 Medium

156 of 255

Analyzing +4 | -1

Choose the odd one w.r.t. brush bordered
enzymes.

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Correct option: C

Amylase

Option C (Amylase) is correct because amylase is secreted in saliva and pancreatic juice, not as a brush-bordered enzyme on the intestinal lining.

157 Medium

157 of 255

Remembering +4 | -1

The pH value at which pepsin becomes inactive is

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Correct option: A

Below pH 2

The correct answer is D (Above pH 5) because pepsin is most active in a highly acidic environment (pH 1.5-2.5) and becomes inactive at a pH above 5.

158 Easy

158 of 255

Application +4 | -1

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?

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Correct option: A

144

Option A (144) 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.

159 Easy

159 of 255

Remembering +4 | -1

Which one of the following is vestigial organ of human?

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Correct option: C

Wisdom teeth

Option C (Wisdom teeth) is correct because wisdom teeth are vestigial organs in humans, often serving no functional purpose.

160 Hard

160 of 255

Understanding +4 | -1

Identify, wheather the given nutrients are absorbed by the active transport, simple diffusion or facilitated transport
I. Glucose
II. Fructose
III. Vitamin-K
IV. Amino acids
Choose the correct option accordingly

View answer and explanation

Correct option: C

I-Active transport
II- Facilited transport
III-Simple diffusion
II-Active transport

Option C (I-Active transport, II- Facilitated transport, III-Simple diffusion, IV-Active transport) is correct because it accurately describes the absorption mechanisms for each nutrient.

161 Medium

161 of 255

Remembering +4 | -1

Carnassial teeth are modified for

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Correct option: D

Cutting

Option D (Cutting) is correct because carnassial teeth are modified for shearing or cutting flesh.

162 Hard

162 of 255

Understanding +4 | -1

Fat present below the skin surface in our body, acts as a barrier against:

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Correct option: A

Loss of heat from the body

Option A is correct because subcutaneous fat acts as an insulator, reducing heat loss from the body.

163 Easy

163 of 255

Remembering +4 | -1

Secretion of pancreatic juice is stimulated by

View answer and explanation

Correct option: B

Secretin

Option B (Secretin) is correct because secretin is the hormone primarily responsible for stimulating the secretion of pancreatic juice.

164 Medium

164 of 255

Remembering +4 | -1

The contraction of gall bladder is due to

View answer and explanation

Correct option: B

Cholecystokinin

Option B (Cholecystokinin) is correct because cholecystokinin stimulates the contraction of the gall bladder, leading to the release of bile.

165 Hard

165 of 255

Remembering +4 | -1

Select the option that represents correct combination of components of succus entericus.

View answer and explanation

Correct option: B

Enterokinase, lactase, nucleosidase

Option B (Enterokinase, lactase, nucleosidase) is correct because these enzymes are typically found in succus entericus, the intestinal juice secreted by the small intestine.

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166 Medium

166 of 255

Understanding +4 | -1

Which one of the following pairs of the cells with their secretion is correctly matched?

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Correct option: A

Oxyntic cells - A secretion with pH between 2.0 and 3.0

Option A (Oxyntic cells - A secretion with pH between 2.0 and 3.0) is correctly matched because oxyntic cells secrete HCl, which creates a highly acidic environment with a pH between 2.0 and 3.0 in the stomach.

167 Medium

167 of 255

Remembering +4 | -1

Food is masticated with the help of which part of teeth?

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Correct option: A

Enamel

Option A (Enamel) is correct because enamel is the hardest substance in the body and forms the outer layer of the tooth, directly involved in the mastication (chewing) of food.

168 Medium

168 of 255

Remembering +4 | -1

Reverse flow of food in the stomach of rabbit is prevented by

View answer and explanation

Correct option: C

Cardiac sphincter

Option C (Cardiac sphincter) is correct because the cardiac sphincter prevents backflow from the stomach into the esophagus.

169 Medium

169 of 255

Understanding +4 | -1

Bile helps in the digestion of fat through

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Correct option: D

All of these

Option D (All of these) is correct because bile aids in fat digestion through emulsification, alkalinity, and micelle formation.

170 Medium

170 of 255

Understanding +4 | -1

Which of the following processes will be affected by the absence of enterokinase?

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Correct option: C

Proteases → Dipeptide

Option C (Proteases → Dipeptide) is correct because enterokinase activates trypsinogen to trypsin, which then activates other proteases.

171 Easy

171 of 255

Understanding +4 | -1

The condition in which the food is not properly digested leading to a feeling of fullness is called

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Correct option: B

Indigestion

Option B (Indigestion) is correct because indigestion is a condition where food is not properly digested, leading to a feeling of fullness, discomfort, and other digestive symptoms.

172 Easy

172 of 255

Understanding +4 | -1

Digestion of starch starts from the mouth, whereas …A… is the site of digestion mainly for …B….. Choose the correct combination of options to complete the given statement

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Correct option: A

A-stomach; B-protein

Option A is correct because starch digestion begins in the mouth, and protein digestion primarily occurs in the stomach.

173 Easy

173 of 255

Remembering +4 | -1

The Digestive enzyme that is not found in human pancreatic juice is

View answer and explanation

Correct option: A

Nucleotidase

Option A (Nucleotidase) is correct because nucleotidase is an enzyme found in intestinal juice, not pancreatic juice. The other options are all pancreatic enzymes.

174 Easy

174 of 255

Understanding +4 | -1

Complete the equation

\mathrm{Nucleic\;acids\;}\mathrm{\;Nucleotides\;} \to \ldots \ldots \ldots .

View answer and explanation

Correct option: D

Nucleosides

Option D (Nucleosides) is correct because nucleic acids are broken down into nucleotides, which are further broken down into nucleosides and phosphate.

175 Easy

175 of 255

Understanding +4 | -1

What is the process of food passage from buccal cavity to the site of water and mineral absorption

View answer and explanation

Correct option: B

Mouth → Buccal cavity → Pharynx → Oesophagus → Stomach → Duodenum → lleum → Caecum → Rectun

Option B is correct because it accurately represents the sequential passage of food from the mouth to the rectum, including key digestive organs.

176 Medium

176 of 255

Understanding +4 | -1

Why the stool of a breast feeding baby is quite yellowish in colour?

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Correct option: C

Due to the bile pigment of bile juices

Option C (Due to the bile pigment of bile juices) is correct because bilirubin, a bile pigment, is excreted in the stool, giving it a yellowish color.

177 Easy

177 of 255

Understanding +4 | -1

Hormonal control of the secretion of digestive juices is carried out by the local hormones produced by the _____ and _____

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Correct option: D

a – gastric b – intestinal

Option D (a – gastric b – intestinal) is correct because local hormones controlling digestive juice secretion are produced by the gastric and intestinal mucosa.

178 Easy

178 of 255

Remembering +4 | -1

Riboflavin is

View answer and explanation

Correct option: B

Vitamin-

{B_2}

The correct answer is B (Vitamin-

{B_2}

) because riboflavin is the chemical name for Vitamin B2.

179 Easy

179 of 255

Understanding +4 | -1

What do you mean by dental formula?

View answer and explanation

Correct option: B

An arrangement of teeth in each half of the upper and lower jaw in the order of I, C, PM, M

Option B (An arrangement of teeth in each half of the upper and lower jaw in the order of I, C, PM, M) is correct because the dental formula represents the number and arrangement of teeth in each half of both jaws.

180 Hard

180 of 255

Understanding +4 | -1

Assertion: Maximum absorption of food occurs in small intestine.

Reason: Villi & microvilli abundantly present in small intestine.

View answer and explanation

Correct option: D

Both Assertion and Reason are correct and Reason is the correct explanation of Assertion

Option D (Both Assertion and Reason are correct and Reason is the correct explanation of Assertion) is correct because the presence of villi and microvilli in the small intestine increases the surface area for maximum absorption.

Revision notes and key takeaways

Review DIGESTION AND ABSORPTION in your textbook or class notes, then use this set to check your understanding.

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Digestion and absorption practice · Mixed difficulty

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