Which one of the following shows isogamy with non-flagellated gametes?

Options

(a) Sargassum
(b) Ectocarpus
(c) Ulothrix
(d) Spirogyra

Correct Answer:

Spirogyra

Explanation:

In Spirogyra, sexual reproduction occurs through conjugation. Gametes are non-flagellated morphologically similar. But physiologically different (isogamy with physiological anisogamy)