Growth at the end of childhood and during puberty is controlled by

Options

A. Thyroxine
B. Thymosin
C. Somatotrophic hormone
D. Thyroxine and somatotrophic hormones.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the hormones that control growth at the end of childhood and during puberty.

2. **Identifying Key Hormones**: The two main hormones involved in growth during these stages are:
- **Thyroxine**: This hormone is produced by the thyroid gland and plays a crucial role in regulating metabolism, growth, and development.
- **Somatotrophic Hormone (Growth Hormone)**: This hormone is secreted by the pituitary gland and is essential for normal physical growth in children.

3. **Role of Thyroxine**:
- Thyroxine helps in controlling growth and the structure of bones.
- It also contributes to sexual development during puberty and regulates various body functions.

4. **Role of Somatotrophic Hormone**:
- Somatotrophic hormone is vital for normal physical growth in children.
- Its levels increase progressively during childhood, reaching a peak during puberty, which is crucial for the growth spurts associated with this stage.

5. **Conclusion**: Since both thyroxine and somatotrophic hormone play significant roles in growth at the end of childhood and during puberty, the correct answer to the question is that growth is controlled by both **thyroxine and somatotrophic hormones**.

**Final Answer**: The growth at the end of childhood and during puberty is controlled by **thyroxine and somatotrophic hormones**.

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