36. Degree of compost maturity can be assessed by

A. infrared technique
B. germination test
C. both (a) and (b)
D. none of the above

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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

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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

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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

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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

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