Which one of the following is CORRECT for Vallisneria?
(1) it grows in freshwater
(2) Female flowers or pollen grains reach the surface by a long stalk
(3) Male flowers are released on the the surface of the water
(4) Pollen grains are carried passively by water currents

Options

A. only 1
B. only 1 and 2
C. only 1, 2 and 3
D. 1,2,3 and 4

Answer

To determine which statement is correct for Vallisneria, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding Vallisneria**: Vallisneria is an aquatic plant that typically grows in freshwater environments. This is an important characteristic to consider when evaluating the statements.

**Hint**: Consider the habitat of Vallisneria and its ecological requirements.

2. **Evaluating Statement 1**: "It grows in freshwater."
- This statement is true as Vallisneria is known to thrive in freshwater bodies.

**Hint**: Recall the types of environments where Vallisneria is commonly found.

3. **Evaluating Statement 2**: "Female flowers or pollen grains reach the surface by a long stalk."
- This statement is also true. Vallisneria has long stalks that allow the female flowers to rise to the water's surface for pollination.

**Hint**: Think about the structure of Vallisneria and how it facilitates reproduction.

4. **Evaluating Statement 3**: "Male flowers are released on the surface of the water."
- This statement is true. Male flowers of Vallisneria are released into the water and can float to the surface.

**Hint**: Consider the reproductive strategy of Vallisneria and how male flowers are dispersed.

5. **Evaluating Statement 4**: "Pollen grains are carried passively by water currents."
- This statement is true as well. Vallisneria is a water-pollinated plant, and the pollen grains are indeed carried by water currents to the female flowers.

**Hint**: Reflect on the mechanisms of pollination in aquatic plants.

### Conclusion:
All four statements about Vallisneria are correct. Therefore, the correct answer is that all statements are true regarding Vallisneria.

### Final Answer:
All the statements (1, 2, 3, and 4) are correct for Vallisneria.