Read the statements carefully and mark the correct option .
a. Most of the aquatic plants are pollinated by either Insects or air.
b.Vallisneria is dioecious and pollinates underwater .
c. In a artificial hybridization, the female flower of castor does not require emasculation .

Options

A. All statements are correct
B. Only 'a' is incorrect
C. Both 'a' and 'b' are incorrect
D. 'a' and 'b' are correct

Answer

To solve the question, we need to analyze each statement provided and determine their correctness.

### Step-by-Step Solution:

1. **Evaluate Statement A**:
- The statement claims that "Most of the aquatic plants are pollinated by either insects or air."
- **Analysis**: Most aquatic plants, such as Hydrilla and Vallisneria, primarily rely on water for pollination rather than insects or air. Therefore, this statement is **incorrect**.

2. **Evaluate Statement B**:
- The statement claims that "Vallisneria is dioecious and pollinates underwater."
- **Analysis**: Vallisneria is indeed a dioecious plant, meaning it has separate male and female plants. It also pollinates underwater, which is a unique characteristic of this plant. Therefore, this statement is **correct**.

3. **Evaluate Statement C**:
- The statement claims that "In artificial hybridization, the female flower of castor does not require emasculation."
- **Analysis**: The castor plant (Ricinus communis) has unisexual flowers, meaning that the female flowers do not produce anthers. Therefore, emasculation (removal of anthers) is not necessary for the female flowers during artificial hybridization. Thus, this statement is **correct**.

4. **Conclusion**:
- Statement A is incorrect, while Statements B and C are correct.
- Therefore, the correct option is that only Statement A is incorrect.

### Final Answer:
- The correct option is: **Only A is incorrect.**