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

Correct Option: D

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

Volvox is motile colonial fresh water green alga. It forms spherical colonies.

Correct Option: A

Volvox is motile colonial fresh water green alga. It forms spherical colonies.

Male gametes are flagellated in Ectocarpus (phaeophyceae). They possess heterokont, lateral flagella.

Correct Option: B

Male gametes are flagellated in Ectocarpus (phaeophyceae). They possess heterokont, lateral flagella.

Mannitol or laminarin is the stored food in phaeophyceae (brown algae).

Correct Option: C

Mannitol or laminarin is the stored food in phaeophyceae (brown algae).

Chlorella and Spirullina are unicellular algae, rich in proteins and are used as food supplements by space travellers.

Correct Option: B

Chlorella and Spirullina are unicellular algae, rich in proteins and are used as food supplements by space travellers.