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Identify the parts P, Q, R, S… (Class 12 Biology 2026, Q1)

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BiologyCBSE Class 12 · Board exam 2026, set 57/5/1 · 1 mark · MCQ

CBSE Class 12 Biology 2026: question 1

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

Q1 · 1 mark · MCQSexual Reproduction in Flowering Plants

Identify the parts P, Q, R, S in the figure given below and select the option in the correct order.

  1. (A)P: Seed, Q: Thalamus, R: Mesocarp, S: Endocarp
  2. (B)P: Thalamus, Q: Seed, R: Endocarp, S: Mesocarp
  3. (C)P: Seed, Q: Thalamus, R: Endocarp, S: Mesocarp
  4. (D)P: Thalamus, Q: Seed, R: Mesocarp, S: Endocarp

Figure in the paper: Transverse section of a fruit: a large outer circular region labelled P, a central star-shaped five-chambered region with seeds labelled Q, and layers R and S indicated near the inner part around the chambers. See it in the official paper.

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

This is the section of a false fruit (apple). Which floral part forms its fleshy outer region?

Hint 2

The true fruit lies inside the fleshy part. Its walls are the endocarp and mesocarp, and they enclose the seeds.

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 apple is a false fruit: the large fleshy outer part (P) develops from the thalamus, and the central five chambers hold the seeds (Q).

    ½ mark

  2. Around the chambers lie the true fruit layers: the inner cartilaginous endocarp (R) and the mesocarp (S). So the order is Thalamus, Seed, Endocarp, Mesocarp, which is option (B).

    ½ mark

Answer: (B) P: Thalamus, Q: Seed, R: Endocarp, S: Mesocarp

Where the marks are

  • Chooses option (B) (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Sexual Reproduction in Flowering Plants, 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.