Microbiology of Soils – Section 1

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

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