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B
Spirogyra.
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C
Polysiphonia.
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D
Anabaena.
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Solution
The correct option is AEctocarpus. Ectocarpus is a brown alga. It is abundantly found throughout the world in cold waters. The male gametes typically contain a single chloroplast with a pyrenoid and a prominent concave eye spot, into which the swelling of the posterior flagellum (the photoreceptor) fits.