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The best explanation of why many tropical grasses are C4 plants is that

  • (a) C4 plants do not have the Calvin cycle in their leaves Your answer
  • (b) the C4 pathway suits high heat and light and avoids photorespiration Correct
  • (c) C4 plants grow best only in cold, shady places Your answer
  • (d) C4 plants need much less light than C3 plants do Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

Tropical regions have high temperature and strong light. The C4 pathway is suited to these conditions and avoids photorespiration, so many tropical grasses are C4.

Why the other options are wrong

  • (a) · your answer C4 plants do have the Calvin cycle.
  • (c) · your answer C4 plants do best in hot, sunny places.
  • (d) · your answer C4 plants are high-light plants.
NCERT point: Maize, sugarcane and sorghum are tropical C4 grasses.
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