Secondary nucleus is fertilized by male gamete to form–

Options

A. Endosperm
B. Embryo
C. Seed
D. Zygote

Answer

To solve the question, "Secondary nucleus is fertilized by male gamete to form–", we need to understand the process of fertilization in angiosperms (flowering plants). Here's a step-by-step solution:

### Step-by-Step Solution:

1. **Understanding Male Gamete**:
- The male gamete in flowering plants is represented by pollen grains, which are released from the anthers of flowers.

2. **Identifying Female Gametophyte**:
- In angiosperms, the female gametophyte contains structures such as synergids, egg cells, antipodal cells, and importantly, two polar nuclei.

3. **Formation of Secondary Nucleus**:
- The two polar nuclei within the female gametophyte fuse together to form a diploid structure known as the secondary nucleus.

4. **Fertilization Process**:
- When the pollen tube reaches the female gametophyte, it releases two male gametes.
- One male gamete fuses with the secondary nucleus (the diploid nucleus formed from the fusion of polar nuclei).

5. **Result of Fertilization**:
- The fusion of the male gamete with the secondary nucleus results in the formation of the endosperm, which is a tissue that provides nourishment to the developing embryo.

6. **Conclusion**:
- Therefore, the correct answer to the question is that the secondary nucleus is fertilized by the male gamete to form **endosperm**.

### Final Answer:
**Endosperm**

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