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Differentiate between the… (Class 12 Biology 2023, Q28b)

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BiologyCBSE Class 12 · Board exam 2023, set 57/1/1 · 3 marks · Short answer

CBSE Class 12 Biology 2023: question 28(b)

Set in the CBSE Class 12 board exam of 2023, paper 57/1/1, section C, question 28(b), for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q28(b) · 3 marks · Short answerSexual Reproduction in Flowering Plants

Differentiate between the following :
(i) Perisperm and Pericarp
(ii) Syncarpous pistil and Apocarpous pistil
(iii) Plumule and Radicle

Source: official question paper from cbse.gov.in (PDF). See it in the full 2023 board paper, set 57/1/1.

Hints

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

Hint 1

'Peri-sperm' relates to the seed and 'peri-carp' to the fruit; which parts of the ovule or ovary do they come from?

Hint 2

'Syn' means together and 'apo' means separate.

Hint 3

Which end of the embryonal axis becomes the shoot, and which the root?

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. (i)

    PerispermPericarp
    Residual, persistent nucellus present in some seeds (e.g. black pepper, beet)Wall of the fruit, developed from the ovary wall
    1 mark

  2. (ii)

    Syncarpous pistilApocarpous pistil
    Many pistils (carpels) fused together (e.g. Papaver)Many pistils free from each other (e.g. Michelia)
    1 mark

  3. (iii)

    PlumuleRadicle
    Shoot tip at the terminal end of the epicotyl in the embryonal axis; forms the future shoot/stemRoot tip at the terminal end of the hypocotyl; forms the future root
    1 mark

Answer: (i) Perisperm – persistent nucellus; pericarp – fruit wall from ovary wall; (ii) syncarpous – fused pistils; apocarpous – free pistils; (iii) plumule – future shoot (epicotyl end); radicle – future root (hypocotyl end)

Where the marks are

  • Perisperm vs pericarp (1 mark)
  • Syncarpous vs apocarpous (1 mark)
  • Plumule vs radicle (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 paper2023 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.