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A process that makes important difference between C3 and C4 plants is:

1. Transpiration
2. Glycolysis
3. Photosynthesis
4. Photorespiration

Correct answer: Photorespiration

Solution

Photorespiration is a major difference between C3 and C4 plants because C3 plants experience it much more, while C4 plants largely suppress it by concentrating CO2 around RuBisCO. This makes photorespiration the key process distinguishing them.

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