Assertion : Rapid cooling is carried out during cryopreservation of seeds .
Reason : Seeds possess a lot of moisture .

Options

A. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
B. If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion.
C. If Assertion is true but the Reason is false.
D. If both Assertion and Reason are false.

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states that "Rapid cooling is carried out during the cryopreservation of seeds." This is true because cryopreservation involves storing biological material at very low temperatures to preserve it.

2. **Understanding Cryopreservation**: Cryopreservation is a technique that uses extremely low temperatures, often achieved with liquid nitrogen, to halt all biological activity, including the metabolic processes of seeds. This is essential for long-term storage.

3. **Temperature in Cryopreservation**: During cryopreservation, temperatures can reach approximately -196 degrees Celsius. This rapid cooling helps to form intracellular ice crystals, which are crucial for preserving the integrity of the seeds.

4. **Analyzing the Reason**: The reason states that "Seeds possess a lot of moisture." This statement is misleading. While seeds do contain moisture, the typical moisture content in seeds is about 10-15%. This low moisture level is actually beneficial for preservation, as it reduces enzymatic and metabolic activities.

5. **Conclusion**: The assertion is true, as rapid cooling is indeed a part of cryopreservation. However, the reason provided is false because it inaccurately describes the moisture content in seeds. Therefore, the correct relationship is that the assertion is true, but the reason is false.

### Final Answer:
- The assertion is true, but the reason is false.