HARITHA,Subject Matter Expert at Edumarz
Solution:Algae are classified into different types based on the pigments present in them.On the basis of pigments, algae are divided into three classes:Chlorophyceae, Phaeophyceae, and Rhodophyceae.
Algae
Algae are chlorophyll containing, simple, thalloid, autotrophic and mainly aquatic(both marine and freshwater) organisms.They are found in different types of habitats such as moist stones, soils and wood.They also form symbiotic relationships with other organisms such as fungi(lichen) and animals(sloth bear).The mode of reproduction of algae is by vegetative propagation,sexual and asexual methods.
Chlorophyceae
The members of this class are called green algae
Plant body present as unicellular,colonial or filamentous form
Pigments chlorophyll a and chlorophyll b present in larger amounts and therefore they are known as green algae.These pigments are present in chloroplasts.
Most species contain storage bodies called pyrenoids present in chloroplasts
Green algae also contain rigid cell walls formed of an inner layer of cellulose and an outer layer of pectose
Phaeophyceae
The members of this class known as brown algae
They are found mainly in marine habitats.
chlorophyll a, chlorophyll c,carotenoids and xanthophylls are the pigments present in them
Rhodophyceae
The members of this class are called red algae
They possess red pigment r-phycoerythrin in their bodies
Majority of the red algae are found in marine habitats
They reproduce vegetative means by fragmentation