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Assertion (A) : AIDS is a… (Class 12 Biology 2024, Q13)

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BiologyCBSE Class 12 · Board exam 2024, set 57/5/1 · 1 mark · Assertion-reason

CBSE Class 12 Biology 2024: question 13

Set in the CBSE Class 12 board exam of 2024, paper 57/5/1, section A, question 13, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q13 · 1 mark · Assertion-reasonCompetency-basedHuman Health and Disease

Assertion (A) : AIDS is a syndrome caused by HIV.
Reason (R) : HIV is a virus that damages the immune system with DNA as its genetic material.

  1. (A)Both (A) and (R) are true and (R) is the correct explanation of (A).
  2. (B)Both (A) and (R) are true, but (R) is not the correct explanation of (A).
  3. (C)(A) is true, but (R) is false.
  4. (D)(A) is false, but (R) is true.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 57/5/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

What kind of virus is HIV?

Hint 2

Retroviruses carry which nucleic acid?

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. The assertion is true: AIDS is caused by HIV.

  2. The reason is false, because HIV is a retrovirus with RNA, not DNA, as its genetic material. So the answer is option (C).

    1 mark

Answer: (C)

Where the marks are

  • (A) true, (R) false because HIV has RNA as its genome (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Human Health and Disease, one at a time, marked against the answer key and marking points.Back to the full paper2024 board paper, set 57/5/1: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.