When more than 2 male gametes are produced in a pollen tube, it is called

Options

A. Polydactyly
B. Polyspermy
C. Polysiphony
D. Polyspory

Answer

To answer the question, "When more than 2 male gametes are produced in a pollen tube, it is called," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Male Gametes**: Male gametes in flowering plants are produced in pollen grains. Each pollen grain typically contains two male gametes.

2. **Pollen Tube Formation**: When a pollen grain lands on a compatible stigma, it germinates and forms a pollen tube. This tube grows down the style towards the ovule.

3. **Production of Male Gametes**: In some cases, more than two male gametes can be produced within a single pollen tube. This phenomenon needs a specific term to describe it.

4. **Identifying the Correct Term**:
- **Polydactyly**: This term refers to a condition in humans with extra fingers and is not relevant to pollen tubes.
- **Polyspermy**: This term refers to the condition where more than one sperm fertilizes an egg, which can also imply the presence of multiple male gametes in a pollen tube.
- **Polysiphony**: This term describes a situation where multiple pollen tubes invade the embryo sac, which is not related to the number of male gametes.
- **Polyspory**: This term refers to the condition where more than four pollen grains are attached in a tetrad, which is also not relevant to the question.

5. **Conclusion**: The correct answer to the question is **Polyspermy**, as it indicates the condition when more than two male gametes are produced in a pollen tube.

### Final Answer:
When more than 2 male gametes are produced in a pollen tube, it is called **Polyspermy**.

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