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Discussion

C4 and CAM plants have evolved mechanisms that chiefly serve to

  • A.reduce the water content of their leaves
  • B.concentrate carbon dioxide around rubisco
  • C.capture light of a wider range of wavelengths
  • D.store starch in the roots more efficiently

Answer: B

Raising the local carbon dioxide concentration suppresses the wasteful reaction with oxygen. C4 plants separate the steps in space and CAM plants separate them in time, but the aim is the same. Both adaptations are commonest in hot or dry climates where the waste is worst.

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