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In snails individuals… (Class 10 Science SQP 2024-25, Q12)

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ScienceCBSE Class 10 · Sample paper, session 2024-25 · 1 mark · MCQ

CBSE Class 10 Science sample paper 2024-25: question 12

From the official CBSE sample question paper for 2024-25, section A, question 12, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q12 · 1 mark · MCQHeredity

In snails individuals can begin life as male and depending on environmental conditions they can become female as they grow. This is because

  1. (A)male snails have dominant genetic makeup.
  2. (B)female snails have dominant genetic makeup.
  3. (C)expression of sex chromosomes can change in a snail's life time.
  4. (D)sex is not genetically determined in snails.

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2024-25.

Hints

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

Hint 1

If sex can change during life, can it be fixed by genes at birth?

Hint 2

Think of turtles, where temperature decides sex.

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 snails, an individual can change sex during its life depending on environmental conditions.

    ½ mark

  2. This means sex is not fixed by inherited genes or sex chromosomes. Sex is not genetically determined in snails, option (D).

    ½ mark

Answer: Sex is not genetically determined in snails; option (D)

Where the marks are

  • Concludes that sex is not genetically determined in snails (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Heredity, one at a time, marked against the answer key and marking points.Back to the full paperSample paper 2024-25: 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.