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Which characteristic of water pollinated...

Which characteristic of water pollinated species of pollen grains protect them from water?

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### Step-by-Step Solution: 1. **Understanding Water Pollination**: Water pollination occurs in certain species where pollen grains are transferred through water to reach the stigma of another flower. An example of such a species is *Valisneria*. 2. **Identifying the Need for Protection**: Since pollen grains are submerged in water, they need a protective mechanism to prevent them from being damaged or losing viability in the aquatic environment. 3. **Role of Mucilage**: The characteristic that protects the pollen grains in water-pollinated species is a mucilaginous covering. This mucilage is a sticky substance that surrounds the pollen grains. ...
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