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Explain with the help of a… (Class 10 Science 2024, Q29a)

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ScienceCBSE Class 10 · Board exam 2024, set 31/4/1 · 3 marks · Short answer

CBSE Class 10 Science 2024: question 29(a)

Set in the CBSE Class 10 board exam of 2024, paper 31/4/1, section C, question 29(a), for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q29(a) · 3 marks · Short answerHow do Organisms Reproduce?

Explain with the help of a labelled diagram, the process of reproduction in Hydra by budding. Name the cells used for reproduction in this process.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/4/1.

Hints

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

Hint 1

Budding is a form of asexual reproduction in which a new organism grows from an outgrowth of the parent.

Hint 2

Which cells in Hydra divide repeatedly to produce the bud?

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. In Hydra, a small outgrowth called a bud develops at one specific site on the body, due to repeated cell division.

    ½ mark

  2. The bud grows into a tiny individual with tentacles and a mouth. When fully mature, it detaches from the parent and becomes a new, independent Hydra.

    1 mark

  3. Labelled diagram (in words): a row of stages showing the parent Hydra with tentacles; a small bud on the body wall; the bud with developing tentacles; and the bud separating as a young Hydra. Labels: parent Hydra, tentacles, bud, new Hydra.

    1 mark

  4. The cells used are regenerative cells.

    ½ mark

Answer: A bud forms by repeated cell division at one site, grows into a tiny Hydra and detaches. Regenerative cells are used.

Where the marks are

  • Bud formed by repeated cell division at a specific site (½ mark)
  • Bud matures and detaches as a new individual (1 mark)
  • Labelled diagram of the budding stages (1 mark)
  • Names regenerative cells (½ mark)

Revise the chapter

Practise this chapterBoard-style questions from How do Organisms Reproduce?, one at a time, marked against the answer key and marking points.Back to the full paper2024 board paper, set 31/4/1: 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.