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Science (086) — AI-generated practice question

AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.

Q1. [1] medium thorough-understanding
During the formation of germ cells in sexually reproducing organisms, one chromosome from each pair is included in each germ cell. How does this process ensure that an offspring ends up with two copies of each gene — one from each parent? What would happen to the chromosome number of offspring if this reduction did NOT occur during germ cell formation?
  1. A Both A and R are true, and R is the correct explanation of A.
  2. B Both A and R are true, but R is not the correct explanation of A.
  3. C A is true but R is false.
  4. D A is false but R is true.
Generated by claude-sonnet-4-6 · 2026-06-26 01:04 · grounding rag
Model Answer

Germ cells are formed by meiosis, which halves the chromosome number. When two germ cells fuse during fertilisation, the normal number is restored, giving offspring one copy of each gene from each parent. Without this reduction, the chromosome number would double with every generation.

Explanation

This question is conceptual (not a standard Assertion-Reason format despite the options listed). The key ideas from Chapter 7 (section 7.3.1) are: meiosis halves chromosomes in germ cells; fertilisation restores the full number; without meiosis, each generation would have twice the chromosomes of the previous one. Examiners expect you to mention meiosis, halving, fertilisation, and the doubling consequence clearly.

Previous-year CBSE Grade 10 board exam questions, organised by subject and chapter, each with a model answer — free to read and print.