In Cucumber, pollen tube enters embryo sac through

Options

A. Integuments
B. Micropyle
C. Endosperm
D. Chalaza.

Answer

To answer the question "In Cucumber, pollen tube enters embryo sac through", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Structure**:
- The embryo sac is a part of the ovule in flowering plants where fertilization occurs. It is important to know the different parts of the ovule, including the micropyle, chalaza, and integuments.

2. **Identifying the Pollen Tube Pathway**:
- The pollen tube is responsible for delivering sperm cells to the embryo sac for fertilization. It can enter the embryo sac through various routes: porogamy, mesogamy, and chalazogamy.

3. **Defining the Types of Entry**:
- **Porogamy**: The pollen tube enters through the micropyle. This is common in many flowering plants.
- **Mesogamy**: The pollen tube enters through the integuments. This is the case for cucumber.
- **Chalazogamy**: The pollen tube enters through the chalazal tissues.

4. **Applying the Concept to Cucumber**:
- In the case of cucumber, the specific method of entry is mesogamy, meaning the pollen tube enters through the integuments.

5. **Conclusion**:
- Therefore, the correct answer to the question is that in cucumber, the pollen tube enters the embryo sac through the **integuments**.

### Final Answer:
In Cucumber, pollen tube enters embryo sac through **integuments**.

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