A) They are multicellular
B) They form colonies
C) They form blooms in polluted water bodies
D) They can fix atmospheric nitrogen
Correct Answer: A
Solution :
Cyanobacteria is a phylum consisting of two groups of photosynthetic eubacteria (Cyanophyta or Chloroxybacteria). They are unicellular but sometimes become joined in colonies or filaments by a sheath of mucilage. They occur in all aquatic habitats. A few species fix atmospheric nitrogen and thus, contribute to soil fertility. In eutrophic warm ponds and lakes, certain cyanobacteria can reproduce rapidly to form blooms.
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