Entomophilous hydrophyte is

Options

A. Vallisneria
B. Zostera
C. Nymphaea
D. heterostyly

Answer

### Step-by-Step Solution:

1. **Understanding Entomophilous Hydrophyte**:
- An entomophilous hydrophyte is a plant that relies on insects for pollination. The term "entomophilous" refers to insect pollination, while "hydrophyte" refers to plants that grow in water or are aquatic.

2. **Characteristics of Entomophilous Plants**:
- These plants typically have flowers that are brightly colored and often produce a sweet scent to attract insects. They may also secrete nectar, which serves as a reward for the pollinators.

3. **Analyzing the Options**:
- The question provides four options:
- A) Valisneria
- B) Deustera
- C) Nymphaea
- D) Heterostyly

4. **Evaluating Each Option**:
- **A) Valisneria**: This is a freshwater aquatic plant known as tapegrass. It is not brightly colored or scented, so it does not attract insects for pollination.
- **B) Deustera**: This is a genus of seagrasses, commonly known as marine grasses. These plants are also not brightly colored or scented, making them unsuitable as entomophilous hydrophytes.
- **C) Nymphaea**: Commonly known as water lilies, these plants are brightly colored and often scented. They attract insects for pollination, fitting the definition of an entomophilous hydrophyte.
- **D) Heterostyly**: This term refers to a genetic polymorphism in flowers and does not represent a specific plant. Heterostylous flowers are not necessarily brightly colored or scented.

5. **Conclusion**:
- Based on the analysis, the correct answer is **C) Nymphaea**, as it is the only option that meets the criteria of being an entomophilous hydrophyte.

### Final Answer:
**C) Nymphaea**

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