Agar is obtained from which algae?

Which is the dominant pigment in Rhodophyceae?

Write a note on the general characteristics and types of algae.

Food is stored as floridean starch in Rhodophyceae. Mannitol is the reserve food material of which group of algae?

Assertion : Red algae contribute to the production of coral reefs.
Reason : Some red algae secrete and deposit calcium carbonate over their walls.

Which of the following is an unsuitable habitat for algae?