In human digestive system, the enzyme that digests fats is: MCQ with Answer and Explanation

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In human digestive system, the enzyme that digests fats is:

A. Amylase

B. Sucrase

C. Pepsin

D. Lipase

Answer: Option D

Solution (By JKSSB Mock Tests)

Lipase is the fat-digesting enzyme, produced mainly by the pancreas (pancreatic lipase) and also by lingual and gastric glands. It hydrolyzes triglycerides into monoglycerides and free fatty acids. Bile salts emulsify fats, increasing surface area for lipase action. Amylase digests starch, pepsin digests proteins, sucrase hydrolyzes sucrose. Lipase requires colipase for optimal activity.

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Question #1

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Consider the following statements regarding photosynthesis:
1. Light reactions occur in the thylakoid membranes.
2. Oxygen is released from carbon dioxide.
3. ATP and NADPH are produced in the light reactions.
Which of the above is/are correct?

A. 1 and 2 only

B. 1 and 3 only

C. 1, 2, and 3

D. 2 and 3 only

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Correct Answer: Option B

Explanation:
Light reactions occur in thylakoid membranes, producing ATP, NADPH, and oxygen. Oxygen comes from water (photolysis), not CO₂. So statement 2 is incorrect. 1 and 3 are correct.

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Question #2

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Which of the following statements about the circulatory system is correct?

A. The heart of a fish has four chambers.

B. Blood pressure is highest in the veins.

C. The foramen ovale is a valve in the adult heart.

D. The hepatic portal vein carries blood from the intestine to the liver.

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Correct Answer: Option D

Explanation:
The hepatic portal system directs nutrient-rich blood from intestines to liver. Blood pressure is highest in arteries; fish have two-chambered heart; foramen ovale is a fetal structure that closes after birth.

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Question #3

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Assertion (A): The cell membrane is described by the fluid mosaic model. Reason (R): The phospholipid bilayer is fluid, and proteins are embedded like a mosaic.

A. A is false, but R is true.

B. Both A and R are true, and R is the correct explanation of A.

C. A is true, but R is false.

D. Both A and R are true, but R is not the correct explanation of A.

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Correct Answer: Option B

Explanation:
The fluid mosaic model, proposed by Singer and Nicolson in 1972, accurately describes the plasma membrane. The phospholipid bilayer has a fluid consistency, allowing lateral movement of lipids and proteins. Proteins float within or on this bilayer, forming a mosaic pattern. Thus, the reason correctly explains the assertion.

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