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Male gametes are flagellated in:

1. Anabaena
2. Ectocarpus
3. Spirogyra
4. Polysiphonia

Correct answer: Ectocarpus

Solution

Ectocarpus is a brown alga that forms motile, flagellated male gametes. The other listed algae do not have flagellated male gametes in the same way: Anabaena is a cyanobacterium, Spirogyra has non-motile gametes, and Polysiphonia has non-flagellated male gametes.

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