Assertion : Auxins help to prevent fruits and leaves droo at early stages.
Reason : Auxins promote the abscission of older mature leaves and fruits.

Options

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

Explanation

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states that "Auxins help to prevent fruits and leaves from dropping at early stages." This means that auxins play a role in keeping young fruits and leaves attached to the plant, thereby preventing premature abscission (the dropping of leaves or fruits).

2. **Understanding the Reason**: The reason states that "Auxins promote the abscission of older mature leaves and fruits." This indicates that while auxins prevent the dropping of young leaves and fruits, they also facilitate the dropping of older, mature ones.

3. **Analyzing the Functions of Auxins**: Auxins are plant hormones that are involved in various growth processes. They are known to:
- Promote cell elongation and growth in shoots and roots.
- Prevent the premature dropping of young leaves and fruits by inhibiting the formation of the abscission zone (the area where the leaf or fruit detaches from the plant).
- Induce the abscission of older leaves and fruits, which is a natural part of the plant's life cycle.

4. **Evaluating the Relationship**: Both the assertion and the reason are true statements about the role of auxins. However, the reason provided does not directly explain the assertion. The assertion focuses on the prevention of dropping in young leaves and fruits, while the reason discusses the promotion of dropping in older leaves and fruits.

5. **Conclusion**: Therefore, the correct answer is that both the assertion and the reason are true, but the reason is not the correct explanation for the assertion.

### Final Answer:
Both the assertion and the reason are true, but the reason is not the correct explanation for the assertion.

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