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
(a) only 1
(b) only 1 and 2
(c) only 1, 2 and 3
(d) 1,2,3 and 4

Options

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

Answer

To solve the question regarding Vallisneria, let's analyze each statement one by one:

1. **Statement 1: It grows in freshwater.**
- Vallisneria is indeed an aquatic plant that primarily grows in freshwater environments. Therefore, this statement is **correct**.

2. **Statement 2: Female flowers or pollen grains reach the surface by a long stalk.**
- Vallisneria has long stalks that allow the female flowers to rise to the surface of the water. This adaptation is crucial for the reproductive process, making this statement **correct**.

3. **Statement 3: Male flowers are released on the surface of the water.**
- The male flowers of Vallisneria are released at the surface of the water, where they can come into contact with the female flowers for pollination. Thus, this statement is also **correct**.

4. **Statement 4: Pollen grains are carried passively by water currents.**
- In Vallisneria, pollen grains are indeed carried by water currents to reach the female flowers, facilitating pollination. Therefore, this statement is **correct** as well.

Now, let's summarize the findings:
- All four statements about Vallisneria are correct.

Thus, the correct answer is:
**(d) 1, 2, 3 and 4.**