Ncert Exercises & Solutions

The green scum seen in the freshwater bodies is

1. blue-green algae

2. red algae

3. green algae

4. Both (a) and (c)

Ans. (d) The green scum seen in the freshwater bodies mainly consists of green algae and blue-green algae, while the red algae are mostly marine.
Page 277, XII NCERT

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