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Identify A, B, C and D in the… (Class 12 Biology 2024, Q17)

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BiologyCBSE Class 12 · Board exam 2024, set 57/1/1 · 2 marks · Very short answer

CBSE Class 12 Biology 2024: question 17

Set in the CBSE Class 12 board exam of 2024, 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 answerSexual Reproduction in Flowering Plants

Identify A, B, C and D in the table given below :

TermsPart of the plant it represents
Pericarp'A'
'B'Cotyledon in seed of grass family
Embryonal axis'C'
'D'Remains of nucellus in a seed

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

Hints

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

Hint 1

Recall what each part of the ovule and ovary turns into after fertilisation.

Hint 2

Pericarp comes from the ovary wall, and the nucellus remnant has a special name ending in '-sperm'.

Hint 3

The grass cotyledon is shield-shaped. Its name comes from the Latin word for 'shield'.

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 – Pericarp is the wall of the fruit, which develops from the wall of the ripened ovary.

    ½ mark

  2. B – The single cotyledon in the seed of the grass family (e.g. maize, wheat) is called the scutellum.

    ½ mark

  3. C – The embryonal axis bears the radicle (root tip) and the plumule (shoot tip). The portion above the cotyledon is the epicotyl and the portion below it is the hypocotyl.

    ½ mark

  4. D – Remains of the nucellus that persist in some seeds (e.g. black pepper, beet) form the perisperm.

    ½ mark

Answer: A – Wall of fruit (ripened ovary wall); B – Scutellum; C – Radicle/Plumule (epicotyl, hypocotyl); D – Perisperm

Where the marks are

  • A: wall of fruit / ripened ovary wall (½ mark)
  • B: scutellum (½ mark)
  • C: radicle / plumule / epicotyl / hypocotyl (½ mark)
  • D: perisperm (½ 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 paper2024 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.