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Name the lymphoid organ that… (Class 12 Biology 2026, Q19)

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BiologyCBSE Class 12 · Board exam 2026, set 57/5/1 · 2 marks · Very short answer

CBSE Class 12 Biology 2026: question 19

Set in the CBSE Class 12 board exam of 2026, paper 57/5/1, section B, question 19, for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q19 · 2 marks · Very short answerHuman Health and Disease

Name the lymphoid organ that acts as a large reservoir of erythrocytes. Explain its role as a lymphoid organ.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 57/5/1.

Hints

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

Hint 1

It is a secondary lymphoid organ that also stores red blood cells.

Hint 2

Its lymphocytes and phagocytes act on blood rather than on lymph. What do they remove from it?

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 organ is the spleen, a large bean-shaped secondary lymphoid organ.

    1 mark

  2. As a lymphoid organ, the spleen contains mainly lymphocytes and phagocytes. It acts as a filter of the blood by trapping blood-borne microorganisms, which the immune cells then destroy.

    1 mark

Answer: Spleen; it filters blood by trapping blood-borne microorganisms.

Where the marks are

  • Names the spleen (1 mark)
  • States that it filters blood by trapping blood-borne microorganisms (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 paper2026 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.