Choose the correct pair from the following regarding responses to abiotic factors.

Options

A. Aestivation : Phytoplankton
B. Hibernation : seals
C. Dormancy : snails
D. Diapause : zooplankton

Answer

To solve the question regarding the correct pair of responses to abiotic factors, we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding Abiotic Factors**: Abiotic factors are non-living chemical and physical parts of the environment that affect living organisms and the functioning of ecosystems. Examples include temperature, water, sunlight, and soil.

2. **Analyzing the Options**:
- **Option A: Astivation - Phytoplankton**:
- Astivation is a state of dormancy that occurs in response to high temperatures or drought conditions, often referred to as "summer sleep." Phytoplankton are aquatic plants that do not undergo astivation. Therefore, this pair is incorrect.

- **Option B: Hibernation - Seals**:
- Hibernation is a state of inactivity and metabolic depression in animals during winter. Seals do not hibernate; they are more active in cold waters and do not enter a state of hibernation. Thus, this pair is also incorrect.

- **Option C: Dormancy - Snails**:
- Dormancy refers to a period when seeds or organisms are inactive due to unfavorable conditions. While snails can enter a state of dormancy, the term is more commonly associated with seeds. Therefore, this pair is not the best match.

- **Option D: Diapause - Zooplankton**:
- Diapause is a period of suspended development in response to unfavorable environmental conditions. It is commonly observed in zooplankton, particularly in their eggs, which can enter diapause until conditions improve. This pair is correct.

3. **Conclusion**: After analyzing all the options, the correct pair regarding responses to abiotic factors is **Diapause - Zooplankton**.

### Final Answer:
**The correct pair is: Diapause - Zooplankton.**