A) I and II
B) II and III
C) I and III
D) I and IV
Correct Answer: B
Solution :
Nostoc is a blue-green alga or cyanobacterium. It is a filamentous and in most cases a colonial blue-green alga. It occurs in Free State as well as in symbiotic association with Anthoceros (a bryophyte) or with Gunnera maincata (an angiospermic marsh plant).
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