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Answer the following. (Class 12 Biology 2026, Q17)

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BiologyCBSE Class 12 · Board exam 2026, set 57/1/1 · 2 marks · Very short answer

CBSE Class 12 Biology 2026: question 17

Set in the CBSE Class 12 board exam of 2026, paper 57/1/1, section B, question 17, for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q17 · 2 marks · Very short answerHuman Health and Disease

Answer the following.

  1. (a)

    Define Humoral immune response.

    1 mark
  2. (b)

    Name any two types of antibodies found to give humoral immune response in humans.

    1 mark

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 57/1/1.

Hints

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

Hint 1

'Humor' refers to body fluids. Which lymphocytes release their products into them?

Hint 2

Antibodies are immunoglobulins (Ig). Recall the letters that follow 'Ig'.

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. (a) Humoral immune response is the immune response carried out by antibodies. B-lymphocytes produce an army of these proteins (antibodies) and release them into the blood (body fluids, or humor) to fight the pathogens.

    1 mark

  2. (b) Any two antibody types: IgG and IgA (others: IgM, IgE).

    1 mark

Answer: (a) Antibody-mediated immunity in which B-lymphocytes secrete antibodies into the blood against pathogens; (b) IgG, IgA (also IgM, IgE)

Where the marks are

  • Defines humoral response as antibody production by B-lymphocytes into the blood against pathogens (1 mark)
  • Names any two of IgA, IgE, IgM, IgG (½ + ½ 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 paper2026 board paper, set 57/1/1: 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.