E-PolyLearning

51. During dark reactions, photosynthesis takes place by help of certain enzymes through cycle called
a. kerb's cycle
b. life cycle
c. calvin cycle
d. nitrogen cycle
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Answer: (c).calvin cycle

52. Study of energy relationships and energy conversions in biological systems is termed as
a. microbiology
b. biotechnology
c. bioenergetics
d. biophysics
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Answer: (c).bioenergetics

53. When there is no exchange between leaves and atmosphere due to balance of respiration and photosynthesis, this condition is known as
a. balanced point
b. unbalanced point
c. redemption point
d. compensation point
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Answer: (d).compensation point

54. After decomposition of household sewage, the dried substance results in
a. sludge
b. fertilizer
c. land fill
d. all of above
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Answer: (d).all of above

55. Before discharging decomposed sewage into rivers and seas, the
a. water is filtered only
b. pathogens are removed only
c. pH of sewage is neutralized
d. water is filtered and pathogens are removed
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Answer: (d).water is filtered and pathogens are removed