a) Algae are autotrophic organisms.
b) They have green pigment chlorophyll.
c) They are major producers in marine ecosystem.
d) They are non-vascular plants.
e) They have a plant body called thallus.
f) They are eukaryotic with prominent nucleus and many plastids.
g) The cell wall is composed of cellulose and pectin.
h) Algae reproduce by vegetative, asexual and sexual methods. Vegetative reproduction
is by fragmentation of thallus. Asexual reproduction takes place by formation of
spores. Sexual reproduction is by fusion of male and female gametes.
Example: Spirogyra, Ulothrix, Batrachospermum, Polysiphonia, Sargassum and
Ectocarpus.