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58. Atmospheric CO2  contains the naturally occurring stable carbon isotopes 12C and 13C in the proportion of 98.9% and 1.1%, respectively. Following are some of the statements regarding CO2 assimilation: […]

57. In which molecule would the radiolabel appear the earliest when wheat and sugarcane leaves are fed with 14CO2? (1) Wheat : malate, sugarcane : 3 phosphoglycerate. (2) Wheat : […]

56. Photo-chemically generated ATP is consumed in which one of the following phases of Calvin-Benson cycle? (1) Only carboxylation (2) Only regeneration (3) Carboxylation and reduction (4) Reduction and regeneration […]

55. Calvin-Benson cycle is divided into three phases, namely carboxylation, reduction and regeneration. The following statements are related to the three phases of Calvin-Benson cycle: A. The product of light […]

54. A student listed following combinations of enzymes and their involvement in different phases of Calvin-Benson cycle: (A) Phosphoglycerate kinase — Reduction phase (B) Glyceraldehyde-3-phosphate dehydrogenase — Regeneration phase (C) […]

53. Which one of the following reactions takes place during the reduction phase of the Calvin- Benson cycle? (1) Ribulose 1,5-bisphosphate to 3-phosphoglycerate (2) 1,3-bisphosphoglycerate to glyceraldehyde-3 phosphate (3) Dihydroxyacetone […]

52. During photosynthetic carbon reduction cycle in green leaves, net production of one molecule of glyceraldehyde 3-phosphate requires one of the following combinations of energy equivalents: (1) 9 NADPH and […]

51. What would be effect on photosynthesis in C3 and C4 plants on elevating the concentration of CO2 under light saturated condition? (1) No effect on both type plants (2) […]

50. Oxygenase activity of RUBISCO generates (1) Two molecules of PGA (2) Two molecules of Phosphoglycolate (3) One molecule each of PGA and phosphoglycolate (4) Two molecules each of PGA […]