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(i) Name the type of asexual… (Class 10 Science 2025, Q35b)

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ScienceCBSE Class 10 · Board exam 2025, set 31/3/1 · 5 marks · Long answer

CBSE Class 10 Science 2025: question 35(b)

Set in the CBSE Class 10 board exam of 2025, paper 31/3/1, section D, question 35(b), for 5 marks. Try it first; the hints and our step-by-step solution are below.

Q35(b) · 5 marks · Long answerHow do Organisms Reproduce?

(i) Name the type of asexual mode of reproduction shown in the given figure.
(ii) Identify the unicellular organism in the diagram.
(iii) List any two advantages of asexual reproduction over sexual reproduction.
(iv) Name and explain any one mode of asexual reproduction observed in Hydra.

Figure in the paper: Six labelled sketches (a) to (f) in sequence of a single elongated cell with a flagellum at the top and a nucleus. In (a) one nucleus; (b) nucleus divides; (c) and (d) two nuclei moving apart; (e) cell elongating with two nuclei and beginning to constrict in the middle; (f) two separate daughter cells connected at the flagellated end. See it in the official paper.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/3/1.

Hints

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

Hint 1

The cell has a flagellum and splits lengthwise into two.

Hint 2

In Hydra, a small outgrowth forms on the body.

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) Binary fission (longitudinal, in a definite plane).

    ½ mark

  2. (ii) The flagellated organism is Leishmania.

    ½ mark

  3. (iii) Advantage 1: a large number of offspring are produced in a short time.

    1 mark

  4. Advantage 2: only one parent is needed and no gametes are formed (offspring are genetically similar).

    1 mark

  5. (iv) Mode: Budding in Hydra.

    1 mark

  6. A bud forms as an outgrowth due to repeated cell division at a specific site; it develops into a tiny individual and, on maturing, detaches from the parent to become a new independent Hydra.

    1 mark

Answer: (i) Binary fission; (ii) Leishmania; (iii) many offspring quickly, single parent/no gametes; (iv) budding

Where the marks are

  • Binary fission (½ mark)
  • Leishmania (½ mark)
  • Two advantages (1 + 1 mark)
  • Names budding (1 mark) and explains it (1 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 paper2025 board paper, set 31/3/1: 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.