36. Degree of compost maturity can be assesed by
A.infrared technique
B.germination test
C.both (a) and (b)
D.none of the above
37. The energy value of biogas is typically
A.400-700 BTU/ft3
B.1,000 BTU/ft3
C.1500 BTU/ft3
D.more than 5000 BTU/ft3
38. The microbial ecosystem of soil includes
A.biotic components of soil
B.abiotic components of soil
C.biotic and abiotic components of soil
D.none of the above
39. Denitrification is carried out
A.usually by facultative anaerobes
B.predominantly by Pseudomonas spp
C.predominantly by Bacillus spp
D.all of the above
40. Which of the following soil microorganism is involved in the reduction of sulfates to H2S?
A.Thiobacillus thiooxidans
B.Desulfotomaculum
C.Rhodospirillum
D.Rhodomicrobium
41. The diagnostic enzyme for nitrogen-fixing organisms is
A.nitrogenase
B.nitrate reductase
C.nitrate oxidase
D.none of these
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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