Question

why algae are green in colour​

Answer 1

Green algae have chloroplasts that contain chlorophyll a and b, giving them a bright green color, as well as the accessory pigments beta carotene and xanthophylls, in stacked thylakoids. The cell walls of green algae usually contain cellulose, and they store carbohydrate in the form of starch.

Answer 2

green algae have chloroplast that contains chlorophyll that's why algae are green in colour