Male gametes are flagellated in (a) Ectocarpus (b) Spirogyra (c) Polysiphonia (d) Anabaena.
Option A Ectocarpus produces biflagellate gametes. Anabaena is a cyanobacteria and does not reproduce sexually. Spirogyra produces nonflagellated male gamete during conjugation, where entire cell content functions as gamete. Polysiphonia also produces non flagellated spermatia.
