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Sugarcane fixes CO2 very efficiently because it uses the

  • (a) glycolytic pathway Your answer
  • (b) Hatch and Slack pathway Correct
  • (c) Krebs cycle Your answer
  • (d) Calvin cycle only Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

Sugarcane is a C4 plant. The Hatch and Slack (C4) pathway concentrates CO2 around RuBisCO, so CO2 is fixed efficiently and photorespiration is avoided.

Why the other options are wrong

  • (a) · your answer Glycolysis breaks down glucose; it does not fix CO2.
  • (c) · your answer The Krebs cycle releases CO2; it does not fix it.
  • (d) · your answer Sugarcane uses the Calvin cycle too, but its efficiency comes from the C4 pathway.
NCERT point: C4 plants show higher productivity at high temperature and light.
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