In Vallisneria

Options

A. The female flower reaches the surface of water by the long stalk
B. The female flowers are released on to the surface of water
C. Female flowers remain submerged in water
D. Pollen grains are released inside the water

Answer

### Step-by-Step Solution:

1. **Understanding Vallisneria**: Vallisneria is an aquatic flowering plant that exhibits a unique method of sexual reproduction involving both male and female flowers.

2. **Identification of Flowers**: Vallisneria has two types of flowers:
- **Female Flowers**: These flowers are characterized by their long stalks that allow them to reach the surface of the water.
- **Male Flowers**: These flowers are typically smaller and produce pollen grains.

3. **Pollination Process**:
- The male flowers release pollen grains onto the surface of the water.
- The current of the water carries these pollen grains toward the female flowers.

4. **Reaching the Female Flower**: The female flowers, which are positioned at the water's surface due to their long stalks, receive the pollen grains.

5. **Germination**: Once the pollen grains land on the stigma of the female flower, they germinate, leading to fertilization.

6. **Evaluating Statements**:
- **Statement 1**: Female flowers reach the water surface with the help of a long stalk. (Correct)
- **Statement 2**: Female flowers are released on the surface of the water. (Incorrect)
- **Statement 3**: Female flowers are submerged in water. (Incorrect)
- **Statement 4**: Pollen grains are released inside the water. (Incorrect)

7. **Conclusion**: Based on the evaluation of the statements, the correct answer is that female flowers reach the surface of the water with the help of their long stalks.