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The correct sequence of plants in a hydrosere is:

1. Volvox → Hydrilla → Pistia → Scirpus → Lantana → Oak
2. Pistia → Volvox → Scirpus → Hydrilla → Oak → Lantana
3. Oak → Lantana → Volvox → Hydrilla → Pistia → Scirpus
4. Oak → Lantana → Scirpus → Pistia → Hydrilla → Volvox

Correct answer: Volvox → Hydrilla → Pistia → Scirpus → Lantana → Oak

Solution

A hydrosere is ecological succession in a water body that gradually fills in and becomes drier. The sequence moves from aquatic pioneers like Volvox to submerged and floating plants, then marsh plants, shrubs, and finally a climax forest such as Oak.

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