Describe economic importance of green algae.

Explanation

(i) Food `:` A number of green algae are edible. Examples `:` Chlorella, ulva Caaulerpa, Oedogonium etc.
(ii) Sewage decomposition `:` Few members of green algae help in the decomposition of sewage material, because they provide oxygen for oxidation. Examples `:` Chlorella , Pandorina Chlamydomonas etc.
(iii) Antibiotics `:` Few members of green algae produce some chemical that stops the activities of other micro-organisms. Examples `:` Chlorelline an antibiotic is obtained from chlorella.
(iv) Space research studies `:` Green algae like chlorella can be used for prolonged space flight as it provides oxygen and consumes `CO_(2)`.