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a
Ectocarpus
b
Spirogyra
c
Polysiphonia
d
Anabaena
answer is A.
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Detailed Solution
Ectocarpus contain flagellated male gametes. Therefore, they are motile. Spirogyra undergoes sexual reproduction by conjugation and the male gametes are non-motile.Polysiphonia produces spermatium which are non-motile and are carried to the female gamete with water.Anabaena is a cyanobacteria and they lack any flagellated cells