"Pollen grains are protected by a mucilaginous covering and having a specific gravity." This is characteristic of which type of pollination
(a) Anemophily
(b) Entomophily
(c) Hydrophily
(d) Zoophily

Options

A. Anemophily
B. Entomophily
C. Hydrophily
D. Zoophily.

Answer

To determine which type of pollination is characterized by pollen grains that are protected by a mucilaginous covering and have a specific gravity, we need to analyze the options provided.

### Step-by-Step Solution:

1. **Understanding the Question**: The question states that pollen grains have a mucilaginous covering and a specific gravity. We need to identify which type of pollination this characteristic belongs to.

2. **Analyzing the Options**:
- **(a) Anemophily**: This type of pollination is mediated by wind. Pollen grains in wind-pollinated plants are usually lightweight and not covered by mucilage, as they need to be easily carried by air currents.
- **(b) Entomophily**: This type of pollination is mediated by insects. Pollen grains in insect-pollinated plants may have some adaptations for attachment to insects, but they do not typically have a mucilaginous covering.
- **(c) Hydrophily**: This type of pollination is mediated by water. Pollen grains in aquatic plants often have a mucilaginous covering to prevent them from getting wet and to help them remain buoyant in water. This is consistent with the characteristics mentioned in the question.
- **(d) Zoophily**: This type of pollination is mediated by animals other than insects. While some adaptations may be present, the specific characteristic of a mucilaginous covering is not typical for this type of pollination.

3. **Conclusion**: Based on the analysis, the type of pollination characterized by pollen grains that are protected by a mucilaginous covering and have a specific gravity is **(c) Hydrophily**.

### Final Answer:
(c) Hydrophily