Assertion : Nuclear endosperm is formed by subsequent nuclear division without wall formation
Reason : Coconut is an example of such endosperm, where the endosperm remains nuclear throughout the development of the fruit.

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 reson are false.

Explanation

To solve the given assertion and reason question, let's break it down step by step:

### Step 1: Analyze the Assertion
**Assertion**: Nuclear endosperm is formed by subsequent nuclear division without wall formation.

- During fertilization in flowering plants, two male gametes enter the embryo sac. One male gamete fuses with the egg cell to form the zygote, while the other fuses with the two polar nuclei in the central cell to form the primary endosperm nucleus (PEN).
- This primary endosperm nucleus undergoes multiple divisions without the formation of cell walls, resulting in a stage called the free nuclear endosperm. Therefore, the assertion is **true**.

### Step 2: Analyze the Reason
**Reason**: Coconut is an example of such endosperm, where the endosperm remains nuclear throughout the development of the fruit.

- In the case of coconut, the initial stages of endosperm development do feature nuclear endosperm (often referred to as coconut milk). However, as the coconut fruit develops, it eventually forms cellular endosperm as well (coconut meat).
- Therefore, the statement that the endosperm remains nuclear throughout the development of the fruit is **false**.

### Step 3: Conclusion
- Since the assertion is true and the reason is false, the correct answer is that the assertion is true but the reason is false.

### Final Answer:
**The correct option is: Assertion is true, but Reason is false.**

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