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1. What is the basis of classification of algae?

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Algae are chlorophyll-containing thallus-bearing plants characterised by the absence of embryo stage. A variety of algae are found in a variety of habitats. The various types of algae are classified on the basis of their pigments, flagellation and the reserve food material. Based on these criteria, algae are of three types i.e. red algae, brown algae and green algae.

Feature  Chlorophyceae Phaeophyceae Rhodophyceae
Pigment Chlorophyll a and b Chlorophyll a, c and fucoxanthin Chlorophyll a, b and phycoerythrine
Reserve food material  Starch Mannitol and laminarin  Floridean starch
Cell wall composition Cellulose Cellulose and algin  Cellulose and pectin 
Flagella 2-8, equal and apical 2, unequal and lateral Absent 

 

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