At the time of entering embryo sac the pollen tube contains

Options

A. two male gametes
B. two male nuclei
C. four male gametes
D. three male gametes

Answer

To answer the question "At the time of entering the embryo sac, the pollen tube contains," we can break down the process step by step:

### Step-by-Step Solution:

1. **Pollination Process**:
- Pollination occurs when a pollen grain lands on the stigma of a flower. This is the first step in the fertilization process.

2. **Pollen Tube Germination**:
- After successful pollination, the pollen grain germinates, and a pollen tube begins to grow. This tube extends down through the style towards the ovary.

3. **Movement of Cytoplasm**:
- During the growth of the pollen tube, the cytoplasm from the vegetative cell of the pollen grain moves into the pollen tube. This cytoplasmic movement is essential for the growth and development of the pollen tube.

4. **Formation of Male Gametes**:
- Inside the pollen grain, the generative cell undergoes mitosis to produce two male gametes. These gametes are crucial for fertilization.

5. **Contents of the Pollen Tube**:
- As the pollen tube grows and approaches the ovule, it carries with it the vegetative cell and the two male gametes. The vegetative cell is responsible for the growth of the pollen tube, while the two male gametes are necessary for fertilization.

6. **Entry into the Embryo Sac**:
- When the pollen tube enters the embryo sac, it contains the two male gametes. This is the key point of the question.

### Conclusion:
At the time of entering the embryo sac, the pollen tube contains **two male gametes**.