Triple fusion involves fusion of
(A) Two male gametes and one egg
(B) Two eggs and one male gamete
(C) Two male gametes and secondary nucleus
(D) One male gamete and two polar nuclei

Options

A. Two male gametes and one egg
B. Two eggs and one male gamete
C. Two male gametes and secondary nucleus
D. One male gamete and two polar nuclei.

Answer

To solve the question regarding triple fusion, we need to analyze the process of fertilization in flowering plants (angiosperms) and understand what triple fusion specifically entails.

### Step-by-Step Solution:

1. **Understanding Triple Fusion**:
- Triple fusion is a process that occurs during fertilization in angiosperms. It involves the fusion of gametes and nuclei within the embryo sac.

2. **Identifying the Components**:
- In the pollen tube, two male gametes are produced. These gametes travel to the embryo sac where fertilization occurs.
- The embryo sac contains an egg cell and a central cell that has two polar nuclei.

3. **First Male Gamete Fusion**:
- The first male gamete fuses with the egg cell, resulting in the formation of a diploid zygote. This process is known as syngamy.

4. **Second Male Gamete Fusion**:
- The second male gamete fuses with the two polar nuclei present in the central cell. This fusion results in the formation of a triploid structure known as the endosperm.

5. **Conclusion**:
- Since triple fusion specifically refers to the fusion of one male gamete with the two polar nuclei, the correct answer to the question is:
- **(D) One male gamete and two polar nuclei**.

### Final Answer:
(D) One male gamete and two polar nuclei.

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