State the name of the chief pollinating agent of the following flowers:
Vallisneria

Explanation

**Step-by-Step Solution:**

1. **Understanding Pollination**: Begin by understanding what pollination is. It is the transfer of pollen from the male part of a flower (anther) to the female part (stigma) of the same or another flower.

2. **Types of Pollination**: Recognize that there are two main types of pollination: self-pollination (where a flower pollinates itself) and cross-pollination (where pollen is transferred between different flowers). Cross-pollination often requires external agents.

3. **Identifying Pollinating Agents**: Pollinating agents can be biotic (living organisms) or abiotic (non-living factors). Biotic agents include insects (entomophilous), birds and bats (zoophilous), while abiotic agents include wind (anemophilous) and water (hydrophilous).

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