Entry of the pollen tube in to the embryosac in anatropous ovule occurs through

Options

A. Micropylar end
B. Chalazal
C. Centeral cell
D. Egg cell

Answer

To solve the question regarding the entry of the pollen tube into the embryo sac in an anatropous ovule, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Anatropous Ovule**:
- An anatropous ovule is characterized by its inverted position, where the micropyle (the opening) faces downwards, and the chalazal end is positioned upwards. This inversion is a key feature of the anatropous ovule.

2. **Identifying the Micropilar End**:
- The micropilar end is the part of the ovule where the pollen tube enters. In an anatropous ovule, this end is located near the base of the ovule, making it accessible for the pollen tube to penetrate.

3. **Pollen Tube Entry**:
- The pollen tube, which carries the male gametes, grows towards the embryo sac and enters through the micropilar end. This is the specific point of entry for fertilization to occur.

4. **Double Fertilization Process**:
- Once the pollen tube enters the embryo sac, it releases two male gametes. One male gamete fuses with the egg cell (female gamete), while the other fuses with the central cell to form the diploid endosperm. This process is known as double fertilization, a unique feature of angiosperms.

5. **Conclusion**:
- Therefore, the entry of the pollen tube into the embryo sac in an anatropous ovule occurs specifically through the micropilar end.

### Final Answer:
The entry of the pollen tube into the embryo sac in an anatropous ovule occurs through the **micropilar end**.

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