A: Triple fusion is associated with the sexual reproduction in all spermatophytes
r: It is required to form definitive nucleus as nutritive tissue

Options

A. if both assertion & reason are true and the reason is the correct explanation of the assertion then mark
B. if both assertion & reason are true and the reason is not the correct explanation of the assertion then mark
C. if assertion is true statement but reason is false then mark
D. if both assertion and reason are false statements then mark

Answer

To solve the assertion and reason question regarding triple fusion in spermatophytes, we will analyze both statements step by step.

### Step 1: Analyze the Assertion
The assertion states: "Triple fusion is associated with the sexual reproduction in all spermatophytes."

- **Definition of Spermatophytes**: Spermatophytes are seed-producing plants, which include both gymnosperms and angiosperms.
- **Understanding Triple Fusion**: Triple fusion occurs during fertilization in angiosperms, where one male gamete fuses with two polar nuclei in the central cell of the embryo sac, resulting in the formation of a primary endospermic nucleus (PEN).
- **Conclusion on Assertion**: While triple fusion is indeed a characteristic feature of angiosperms, it is not present in gymnosperms. Therefore, the assertion that triple fusion is associated with all spermatophytes is **false**.

### Step 2: Analyze the Reason
The reason states: "It is required to form definitive nucleus as nutritive tissue."

- **Understanding Definitive Nucleus**: The definitive nucleus is formed from the fusion of the male gamete with the central cell's polar nuclei.
- **Nutritive Tissue**: The primary endospermic nucleus (PEN), formed through triple fusion, develops into the endosperm, which serves as the nutritive tissue for the developing embryo.
- **Conclusion on Reason**: The statement implies that the definitive nucleus itself is the nutritive tissue, which is incorrect. The nutritive tissue is actually the endosperm that develops from the PEN. Therefore, this reason is also **false**.

### Final Conclusion
Both the assertion and the reason are false. Thus, the correct answer is that both statements are incorrect.