Number of male gametes in the growing pollen tube is :

Options

A. one
B. two
C. three
D. seven

Explanation

To determine the number of male gametes in a growing pollen tube, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Pollen and Male Gametes**:
- Pollen grains are the male gametes produced in the anther of the flower. Each pollen grain contains male gametes.

2. **Pollen Grain Germination**:
- When a compatible pollen grain lands on the stigma of a flower, it germinates. This process involves the growth of a pollen tube.

3. **Formation of the Pollen Tube**:
- The pollen tube grows down through the style towards the ovary, where the ovules are located.

4. **Number of Male Gametes in the Pollen Tube**:
- Each pollen grain typically contains two male gametes. As the pollen tube grows, it carries these two male gametes towards the ovule.

5. **Fertilization Process**:
- Upon reaching the ovule, one male gamete will fuse with the egg cell to form a zygote, while the second male gamete will fuse with the polar nuclei in the central cell to form the endosperm. This process is known as double fertilization.

6. **Conclusion**:
- Therefore, the number of male gametes in the growing pollen tube is **2**.

### Final Answer:
The number of male gametes in the growing pollen tube is **2**.

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