Volvox is a/an:

Ulothrix is

The product of conjugation of $Spirogyra$ is called

In which of the following algae is mannitol stored as reserve food material?

Assertion : Members of Phaeophyceae vary in colour from olive green to various shades of brown.
Reason : Phaeophyceae possess chlorophyll $a, c$,carotenoids and xanthophylls.

An alga which exhibits a diplontic life cycle is