It is an assemblage of photosynthetic aquatic protists including seaweeds and other unicellular forms containing chlorophyll and lack stem roots and leaves.
The algae are photosynthetic thallophytes (plant lacking root stem and leaves) having chlorophyll a as a primary photosynthetic pigment and lack a sterile covering of cells around the reproductive cells. Together with the other land plants, in aquatic ecosystem the algae by photosynthesis play major role in the global primery production. The algae are found in enormous range of habitats, more commonly occur in water both in fresh and marine, from snowfields to the hot spring and from damp earth and plant leaves to sun baked desert soil. Some endolithic algae colonize in the cracks of rocks. It can also occur on shores and coasts, attached to the bottom or live suspended in the water itself. Algae play a very important role in carbon cycle as it is primary producer and the environment has free oxygen due to...
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