The body structure of green algae may be

"Agar-agar" is obtained from .......

Which algae is likely to be found in the deepest water?

$A$: Most of the species of $Chara$ are monoecious but show cross-fertilization.
$R$: The plant body shows protandrous condition.

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

What is the reason for the red color of red algae?