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Given below are two statements.
Statement I: RuBisCO is the most abundant enzyme in the world.
Statement II: Photorespiration does not occur in C4 plants.
In the light of the above statements, choose the correct answer.

  • (a) Both Statement I and Statement II are true. Correct
  • (b) Both Statement I and Statement II are false. Your answer
  • (c) Statement I is true but Statement II is false. Your answer
  • (d) Statement I is false but Statement II is true. Your answer
Your answer: Correct answer: (a)
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Explanation

Why (a) is correct

Both statements are true. RuBisCO is the most abundant enzyme in the world, and photorespiration does not occur in C4 plants because CO2 is kept high around RuBisCO in the bundle sheath.

Why the other options are wrong

  • (b) · your answer Both statements are given in NCERT, so neither is false.
  • (c) · your answer Statement II is also true: C4 plants do not show photorespiration.
  • (d) · your answer Statement I is true: RuBisCO is the most abundant enzyme.
NCERT point: The C4 mechanism raises the CO2 level at the site of RuBisCO, so its oxygenase activity is suppressed.
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