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Which group of plants loses the most water by transpiration per unit of CO2 fixed?

  • (a) all three lose equally Your answer
  • (b) C4 plants Your answer
  • (c) C3 plants Correct
  • (d) CAM plants Your answer
Your answer: Correct answer: (c)
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Explanation

Why (c) is correct

C3 plants lose the most water per unit of CO2 fixed. C4 plants fix CO2 faster and so use water more efficiently, and CAM plants open their stomata only at night.

Why the other options are wrong

  • (a) · your answer Water-use efficiency differs: it is lowest in C3, higher in C4 and highest in CAM plants.
  • (b) · your answer C4 plants use water more efficiently than C3 plants.
  • (d) · your answer CAM plants lose the least water, because their stomata open at night.
NCERT point: Improved water-use efficiency is one advantage of C4 plants.
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