Based on evolutionary relationships, ________ classification systems are now widely accepted.

In algae, the fusion of two gametes dissimilar in size is termed as ________.

The members of Chlorophyceae are commonly called ________ algae.

Green algae usually have a rigid cell wall made of an inner layer of cellulose and an outer layer of ________.

Brown algae vary in colour from olive green to brown depending on the amount of the xanthophyll pigment, ________.