CBSE Class 10 Science sample paper 2026-27: question 6
From the official CBSE sample question paper for 2026-27, section A, question 6, for 1 mark. Try it first; the hints and our step-by-step solution are below.
Q6 · 1 mark · MCQHow do Organisms Reproduce?
The male gamete of an apple plant has seventeen chromosomes. What is the number of chromosomes in the female gamete and in the cells of the adult plant respectively?
- (A)17,17
- (B)17,34
- (C)34,34
- (D)34,51
Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2026-27.
Hints
Open one hint at a time and try again before the next.
Hint 1
Male and female gametes of a species have equal chromosome numbers.
Hint 2
The adult develops from the zygote formed by fusion of two gametes.
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.
Gametes are formed by meiosis and carry half the chromosome number. Male and female gametes of the same species have the same number, so the female gamete has 17.
On fertilisation, the zygote gets chromosomes. All body cells of the adult plant come from the zygote, so they have 34.
- 1 mark
The answer is 17, 34, option (B).
Answer: Option (B): 17, 34
Where the marks are
- Gives 17 for the female gamete and 34 for adult cells, option (B) (1 mark)
Revise the chapter
- Chapter: How do Organisms Reproduce? (notes, formulas, where marks are lost and every past question)
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