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The second stage of hydrosere is occupied by plants like:

1. Azolla
2. Typha
3. Salix
4. Vallisneria

Correct answer: Vallisneria

Solution

The second stage of a hydrosere is the submerged stage, dominated by rooted aquatic plants. Vallisneria is a classic submerged hydrophyte, so it fits this stage better than the others.

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