Which of the following statements regarding responses of organisms to abiotic factors is false?

Options

A. All birds and mammals are capable of thermoregulation
B. Majority of animals and nearly all plants cannot maintain a constant internal environment
C. Very small animals are commonly found in polar regions as they have to spend less energy to generate heat
D. Diapause is a stage of suspended development seen in zooplankton.

Answer

To determine which statement regarding the responses of organisms to abiotic factors is false, we can analyze each option one by one.

### Step-by-Step Solution:

1. **Analyze the First Statement**:
- **Statement**: "All birds and mammals are capable of thermoregulation."
- **Analysis**: This statement is true. Birds and mammals have the ability to maintain a constant internal body temperature, a process known as thermoregulation.

2. **Analyze the Second Statement**:
- **Statement**: "Majority of animals and nearly all plants cannot maintain a constant internal environment."
- **Analysis**: This statement is also true. Most animals (especially ectotherms) and plants do not have the ability to regulate their internal environment, making this statement accurate.

3. **Analyze the Third Statement**:
- **Statement**: "Very small animals are commonly found in polar regions as they have to spend less energy to generate heat."
- **Analysis**: This statement is false. In polar regions, small animals are not commonly found because they have a higher surface area relative to their volume, leading to greater heat loss. Therefore, they would need to expend more energy to maintain their body temperature, which is not efficient in cold environments.

4. **Analyze the Fourth Statement**:
- **Statement**: "Diapause is a stage of suspended development seen in zooplankton."
- **Analysis**: This statement is true. Diapause refers to a period of suspended development that allows organisms like zooplankton to survive unfavorable environmental conditions.

5. **Conclusion**:
- The only false statement among the options is the third one regarding small animals in polar regions.

### Final Answer:
The false statement is: "Very small animals are commonly found in polar regions as they have to spend less energy to generate heat."

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