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Some unicellular organisms… (Class 10 Science 2024, Q24)

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ScienceCBSE Class 10 · Board exam 2024, set 31/5/1 · 2 marks · Very short answer

CBSE Class 10 Science 2024: question 24

Set in the CBSE Class 10 board exam of 2024, paper 31/5/1, section B, question 24, for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q24 · 2 marks · Very short answerHow do Organisms Reproduce?

Some unicellular organisms such as Plasmodium and Leishmania differ in the manner in which they reproduce. Name and explain the reproductive process taking place in them.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/5/1.

Hints

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

Hint 1

Both reproduce by fission. The difference lies in how many daughter cells are formed.

Hint 2

The malaria parasite forms many cells at once. The kala-azar parasite divides into two along a fixed plane.

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. Plasmodium – multiple fission.

    ½ mark

  2. The nucleus divides many times and the single cell then splits into many daughter cells at the same time.

    ½ mark

  3. Leishmania – binary fission.

    ½ mark

  4. The single cell splits into two daughter cells in a definite plane (orientation) with respect to its whip-like flagellum at one end.

    ½ mark

Answer: Plasmodium: multiple fission (one cell gives many daughter cells at once); Leishmania: binary fission in a definite plane (one cell gives two).

Where the marks are

  • Names multiple fission for Plasmodium (½ mark)
  • Explains multiple fission (½ mark)
  • Names binary fission for Leishmania (½ mark)
  • Explains binary fission in a definite orientation (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 31/5/1: 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.