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General ScienceEasyAsked in: NDA · NDA-II 2022, GAT

The digestion of fat in human intestine is performed by

  1. A.trypsin
  2. B.bile and lipase
  3. C.bile and amylase
  4. D.bile and pepsin

Correct answer

B. bile and lipase

Explanation

The correct answer is B, bile and lipase. Bile breaks fat into tiny droplets and lipase then splits those droplets into fatty acids and glycerol.

Bile is made by the liver, stored in the gall bladder and poured into the duodenum. It contains no enzyme, but its bile salts emulsify fats, giving lipase a much larger surface to act on. Pancreatic lipase, along with intestinal lipase, then digests the emulsified fat into fatty acids and glycerol, which are absorbed into the lacteals of the villi in the small intestine.

A is wrong because trypsin, from the pancreas, digests proteins, not fats.

C is wrong because amylase digests starch into maltose; it has no action on fat.

D is wrong because pepsin is a stomach enzyme that digests proteins in an acidic medium.

Exam tip: bile emulsifies, lipase digests; fat ends as fatty acids and glycerol absorbed by lacteals.

Practice Questions

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Q1.General ScienceAsked in: UPSC Civil Services · CSE Prelims 2022, GS Paper IMedium

Which of the following are nitrogen-fixing plants?

1. Alfalfa

2. Amaranth

3. Chickpea

4. Clover

5. Purslane (Kulfa)

6. Spinach

Select the correct answer using the code given below:

  1. A.1, 3 and 4 only
  2. B.1, 3, 5 and 6 only
  3. C.2, 4, 5 and 6 only
  4. D.1, 2, 4, 5 and 6
Show answer
Correct answer: A. 1, 3 and 4 only

Alfalfa, chickpea and clover are legumes, and legumes fix nitrogen. Plants of the legume family (Fabaceae) carry root nodules that house Rhizobium bacteria.

Q2.General ScienceAsked in: UPSC CAPF · CAPF 2017, Paper IMedium

The mass number of an element is NOT changed when it emits

  1. A.Alpha and Beta radiations only
  2. B.Alpha and Gamma radiations only
  3. C.Beta and Gamma radiations only
  4. D.Alpha, Beta and Gamma radiations
Show answer
Correct answer: C. Beta and Gamma radiations only

Neither beta nor gamma emission changes the total number of protons and neutrons in a nucleus, so the mass number stays the same.

Q3.General ScienceAsked in: UPSC CAPF · CAPF 2025, Paper IMedium

Which one among the following statements about facilitated transport in plants is correct?

  1. A.All passive transports are types of facilitated transport.
  2. B.Facilitated transport is an example of active transport.
  3. C.Water moves across plasma membrane by active transport.
  4. D.Facilitated transport requires assistance of carrier proteins.
Show answer
Correct answer: D. Facilitated transport requires assistance of carrier proteins.

In facilitated transport, molecules cross the membrane with the help of membrane proteins, while still moving down their concentration gradient.

Q4.General ScienceAsked in: UPSC CAPF · CAPF 2017, Paper IMedium

Who among the following has coined the term 'Quark', the fundamental particles that make up protons and neutrons in an atomic nucleus ?

  1. A.Richard Feynman
  2. B.Murray Gell-Mann
  3. C.Albert Einstein
  4. D.Niels Bohr
Show answer
Correct answer: B. Murray Gell-Mann

The American physicist Murray Gell-Mann proposed quarks in 1964 and gave them their name. Gell-Mann, and independently George Zweig, suggested that protons, neutrons and other such particles are built from smaller units.