Question

which algae grow on most surface of rocks and Stone
a) Epiphytic
b) Thermophytic
c) Lithophytic
c) parasite
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Answer 1

In these pictures are some more about algae but here is your answer also.

here is your answer:

lithophytic e.g., nostoc,gloeocapsa.

In 4th picture read 1st article.

Answer 2

Answer:

The answer is a option A