# The C_(4) plants are twice as efficient as C_(3) plants in terms of fixing CO_(2) but lose only ...... as much water C_(3) plants for the same

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The C_(4) plants are twice as efficient as C_(3) plants in terms of fixing CO_(2) but lose only ...... as much water C_(3) plants for the same amount of CO_(2) fixed.

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Half, The evolution of the C_(4) or plants photosynthetic system is probably one of the stategies for maximising the ability of CO_(2) while minimising water loss. C_(4) plants are twice as efficient as C_(3) plants in terms of fixing carbon in the form of glucose, but lose only half as much water as a C_(3) plant for the same amount of C_(2) fixed.