The thallus organisation of $Volvox$ is

Define the following terms:
$(i)$ Anisogamous
$(ii)$ Oogamous

Identify the algae shown in the given figure.

Which of the following is incorrectly matched?

In algae exhibiting a haplontic life cycle,which of the following processes involves mitosis?

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