Class 12 Biology MCQs Chapter – 10
41. Most commonly used green manures in India are :
( A ) Crotolaria Juncea
( B ) Sesabaria aculeata
( C ) Cyamopsis tetragonoloba
( D ) All
Answer-( D )
42. Which one is not used as a biopesticide?
( A ) Trichoderma harzianum
( B ) Nucleopolyhedrovirus
( C ) Xanthomonas campestris
( D ) Bacillus thuringiensis
Answer-( C )
43. Streptomycin is obtained from :
( A ) Streptomyces griseus
( B ) S. cerevisae
( C ) S. venezuelae
( D ) S. ramosus
Answer-( B )
44. Process of biogas production is :
( A ) aerobic
( B ) anaerobic
( C ) active process
( D ) passive process
Answer-( B )
45. Which of the following is not biofertilizer ?
( A ) Azotobacter
( B ) Bacillus thuringiensis
( C ) Clostridium
( D ) Azolla
Answer-( B )
46. Masses of bacteria associated with fungal filament to form a mesh like structure is called :
( A ) Flocs
( B ) Methanogen
( C ) Plasminogen
( D ) None of these
Answer-( A )
47. The toxic protein secreted by Bacillus thuringiensis is:
( A ) Tubulin
( B ) Insulin
( C ) Cry protein
( D ) All
Answer-( C )
48. Which of the following is a retro virus?
( A ) Human Immuno Deficienyc virus
( B ) Hepatitis virus
( C ) Microvirus Influenzil
( D ) All of these
Answer-( A )
49. Which microbe is useful in the formation of curd from milk ?
( A ) Clostridium
( B ) Lactobacillus
( C ) Both (A) and (B)
( D ) Streptococcus
Answer-( B )
50. The flour of Idli & Dosa is made by the use of which microbe ?
( A ) Bacteria
( B ) Lactobacillus
( C ) Virus
( D ) Yeast
Answer-( A )
51. Which one of the following is helpful in the improvement of soil ?
( A ) Insecticide
( B ) Biofertilizer
( C ) Yeast
( D ) None of these
Answer-( B )
