A: Bast fibres are collenchymatous fibres.
R: Fibres are absent in secondary phloem.

Options

A. Both Assertion & Reason are true and the reason is the correct explanation of the assertion.
B. Assertion & Reason are true but the reason is not the correct explanation of the assertion.
C. Assertion is true statement but Reason is false.
D. Both Assertion and Reason are false statements.

Answer

To analyze the assertion and reason provided in the question, we will break down the information step by step.

### Step-by-Step Solution:

1. **Understanding the Assertion (A)**:
- The assertion states: "Bast fibres are collenchymatous fibres."
- Bast fibres, also known as phloem fibres, are primarily made up of sclerenchyma tissue, not collenchyma. Sclerenchyma provides structural support and is characterized by thickened cell walls, while collenchyma is more flexible and provides support to growing tissues.
- Therefore, the assertion is **false**.

2. **Understanding the Reason (R)**:
- The reason states: "Fibres are absent in secondary phloem."
- This statement is incorrect because bast fibres (phloem fibres) are indeed present in the secondary phloem. They are a significant component of the secondary phloem and are responsible for providing strength and support to the plant.
- Therefore, the reason is also **false**.

3. **Conclusion**:
- Since both the assertion and the reason are false, the correct conclusion is that both statements do not hold true.

### Final Answer:
Both the assertion (A) and the reason (R) are false.

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