Adaptation to low temperature and freezing in animals occurs due to the production of:-

Options

A. glycerol
B. chaperonins
C. proline
D. alanine

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the adaptation mechanisms in animals that allow them to survive low temperatures and freezing conditions.

2. **Identifying Key Terms**: The key terms in the question are "adaptation," "low temperature," "freezing," and "production." This indicates that we are looking for a substance or mechanism that helps animals cope with cold environments.

3. **Analyzing the Options**: The options provided are:
- Glycerol
- Chaperonins
- Proline
- Alanine

4. **Evaluating Each Option**:
- **Glycerol**: Glycerol is known to act as an antifreeze agent. It helps prevent the formation of ice crystals in the cells of animals, which is crucial for survival in freezing temperatures.
- **Chaperonins**: These are proteins that assist in the proper folding of other proteins but do not specifically relate to cold adaptation.
- **Proline and Alanine**: Both are amino acids, but they do not have a direct role in preventing freezing or low-temperature damage in cells.

5. **Conclusion**: Based on the analysis, glycerol is the correct answer as it is specifically produced by some animals as an adaptation to prevent ice crystal formation in their cells during low temperatures.

6. **Final Answer**: The adaptation to low temperature and freezing in animals occurs due to the production of **glycerol**.

---