External/accessory/secodnary sexual characters first appear in

Options

A. Childhood
B. Puberty
C. Foetus
D. Adulthood

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:**
The question asks when external, accessory, or secondary sexual characters first appear in humans.

2. **Identifying Key Terms:**
- External sexual characters: These are physical traits that distinguish the sexes and develop during puberty.
- Accessory sexual characters: These are additional traits that are not directly involved in reproduction but signify sexual maturity.
- Secondary sexual characters: These are features that develop during puberty due to hormonal changes.

3. **Analyzing the Options:**
- A. Childhood: This is the early stage of life before puberty, where secondary sexual characteristics do not develop.
- B. Puberty: This is the stage of development where significant hormonal changes occur, leading to the development of secondary sexual characteristics.
- C. Fetus: This refers to the stage of development before birth, where the primary sexual characteristics are formed, not the secondary ones.
- D. Childhood (repeated): Same reasoning as option A.

4. **Hormonal Influence:**
- In males, testosterone leads to the development of features such as facial hair (beard, mustaches) and a deeper voice (Adam's apple).
- In females, estrogen leads to the development of features such as breast enlargement and wider hips.

5. **Conclusion:**
Based on the analysis, the correct answer is that external, accessory, and secondary sexual characters first appear during puberty.

**Final Answer:**
B. Puberty

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