Triple fusion in Capsella bursa pastoris is fusion of male gamete with

Options

A. egg
B. synergid
C. secondary nucleus
D. antipodal

Answer

### Step-by-Step Solution:

1. **Understanding the Concept of Triple Fusion**:
- In flowering plants, particularly in the case of Capsella bursa-pastoris, triple fusion refers to the fusion of one male gamete with two polar nuclei present in the embryo sac.

2. **Identifying the Components of the Embryo Sac**:
- The embryo sac contains several important structures:
- **Egg Cell**: Located near the micropyle.
- **Synergids**: Two cells flanking the egg cell.
- **Antipodal Cells**: Three cells located at the opposite end of the embryo sac.
- **Polar Nuclei**: Two nuclei located in the central cell of the embryo sac.

3. **Process of Double Fertilization**:
- In double fertilization, one male gamete fuses with the egg cell to form the zygote (embryo), while the second male gamete fuses with the two polar nuclei (central cell) to form the triploid endosperm.

4. **Identifying the Correct Answer**:
- The question asks specifically about the fusion that occurs during triple fusion.
- The male gamete fuses with the two polar nuclei (which together are referred to as the secondary nucleus) to form the triploid endosperm.
- Therefore, the correct answer to the question is **C: Secondary Nucleus**.

### Final Answer:
The fusion of the male gamete with the secondary nucleus during triple fusion in Capsella bursa-pastoris leads to the formation of the triploid endosperm.

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