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Class 12 Biology MCQs Chapter - 10

Class 12 Biology MCQs Chapter – 10

 

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 )

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