The structures of embryo sac which direct the entry of pollen tube is

Options

A. All the cells of egg apparatus
B. Filiform apparatus
C. Both synergids and antipodals
D. Central cell and synergids

Answer

To answer the question about the structures of the embryo sac that direct the entry of the pollen tube, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Embryo Sac**: The embryo sac is a structure within the ovule of flowering plants, which contains the female gametes. It plays a crucial role in fertilization.

2. **Pollen Tube Formation**: After pollination, the pollen grain lands on the stigma and germinates, forming a pollen tube that grows down through the style towards the ovule.

3. **Entry Point**: The pollen tube enters the embryo sac through a specific region known as the micropyle, which is the opening at one end of the ovule.

4. **Synergids Role**: Inside the embryo sac, there are two synergids located at the micropyle end. These synergids are specialized cells that help guide the pollen tube toward the egg cell.

5. **Filiform Apparatus**: The synergids have structures called the filiform apparatus, which are finger-like projections. These projections play a significant role in directing the pollen tube to enter one of the synergids.

6. **Conclusion**: Based on the above points, the correct answer to the question is that the structures of the embryo sac which direct the entry of the pollen tube are the **filiform apparatus**.

### Final Answer:
The structures of the embryo sac which direct the entry of the pollen tube are the **filiform apparatus**.

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