Biology
Answer
Vallisneria is well developed for cross pollination. It is a dioecious plant where male and female plants are separate. Pollination occurs with the help of water and such flowers are called hydrophilous. The male flowers are very small and on maturity, get detached. They float on the surface of water. The female flowers remains float on long stalks. Free floating male flowers pollinate the female flowers on the surface of water.
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