Q1. [3] deep thorough-understanding
Secondary sexual characters such as changed voice or new hair-growth patterns appear during puberty but are not directly involved in the production of gametes. Why are these changes considered significant in the context of sexual reproduction?
Generated by claude-sonnet-4-6 · 2026-06-26 01:07 · grounding rag
Model Answer
Secondary sexual characters like changed voice in boys and new hair-growth patterns are significant because they act as signals of sexual maturation. Since sexual reproduction requires two individuals to come together for mating and internal transfer of germ-cells, it is important that one individual's state of sexual maturity is identifiable by others. These visible changes during puberty indicate that the reproductive tissues are maturing and the individual is becoming capable of participating in reproduction. Without such signals, the process of mating required for sexual reproduction could not be initiated.
Source: Chapter 7, Section 7.3.3
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Explanation
- The key idea examiners want: secondary sexual characters = signals of sexual maturity to other individuals, which is necessary for mating to occur.
- Avoid saying they "help in gamete production" — the question explicitly states they are not directly involved in that.
- The textbook clearly states: "Many changes during puberty, such as new hair-growth patterns, are signals that sexual maturation is taking place" — use this logic directly.
- One common mistake: students write only that these changes "prepare the body" without linking them to the need for two individuals to identify each other's readiness for mating.