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41. The diagnostic enzyme for nitrogen-fixing organisms is

A. nitrogenase
B. nitrate reductase
C. nitrate oxidase
D. none of these

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42. Which of the following fungi on infecting crop roots can improve their uptake of phosphorus and other nutrients?

A. Saccharomyces cerevisiae
B. VA Mycorrhiza
C. Candida torulopsis
D. Aspergillus niger

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43. Syntrophism involves

A. exchange of nutrients between two species
B. exchange of nutrients among species
C. no exchange of nutrients between two species
D. no exchange of nutrients among species

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44. Assimilative denitrification is done by

A. plants
B. fungi
C. prokaryotes
D. all of these

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