Which type of animals have severe effect of change in temperature of environment?

Options

A. Desert animals
B. Aquatic animals
C. Poikilothermal animals
D. Homoiothermal animals

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which type of animals are severely affected by changes in environmental temperature.

2. **Identifying Animal Types**: We need to consider the different types of animals based on their ability to regulate body temperature. The main categories are:
- Desert animals
- Aquatic animals
- Poikilothermal (cold-blooded) animals
- Homeothermal (warm-blooded) animals

3. **Analyzing Each Option**:
- **Desert Animals**: These animals are adapted to extreme temperatures and can often withstand changes in their environment. Therefore, they are not severely affected.
- **Aquatic Animals**: While they can be affected by temperature changes, many aquatic animals have adaptations to cope with varying temperatures in their environment. Thus, they are not the most affected.
- **Poikilothermal Animals**: These are cold-blooded animals that cannot regulate their internal body temperature. Their body temperature fluctuates with the external environment. Therefore, they are severely affected by changes in temperature.
- **Homeothermal Animals**: These are warm-blooded animals that can maintain a stable internal body temperature regardless of external conditions. They are not severely affected by temperature changes.

4. **Conclusion**: Based on the analysis, the type of animals that would be severely affected by changes in environmental temperature are **Poikilothermal animals**.

5. **Final Answer**: The correct answer is **Poikilothermal animals**.

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