Which one of the following shows isogamy with nonflagellated gametes?

Options

A. Sargassum
B. Ectocarpus
C. Ulothrix
D. Spirogyra

Answer

D

Explanation

(d) Isogamy with non-flagellated gametes is seen in Spirogyra. It can reproduce both by sexual and asexual (vegetative) means. They reproduce sexually by conjugation in which two non-flagellated morphologically similar but physiologically different gemetes (isogamous) fuse together. One filament acts as male gamete and passes through the conjugation tube of another filament which acts as female gamete.