A) Azotobacter and Rhizobium
B) Chlorella and Spirulina
C) Azolla and nitrogen fixing blue-green algae
D) Riccia and Marc/ianria
Correct Answer: C
Solution :
Singh (1977) has reported the use of Azolla a endophytic pteridophyte as a precious green compost for rice cultivation. Blue-green algae, because of their role in \[{{\text{N}}_{\text{2}}}\text{-}\]fixation, are considered ecologically and agriculturally important in tropical rice fields.
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