what is the difference between C3 and C4 pathway ? Share with your friends Share 0 Sumedha Rai answered this Kindly refer to the following links given below:-https://www.meritnation.com/ask-answer/question/what-is-the-difference-between-c3-and-c4-plants-how-is-thi/photosynthesis-in-higher-plants/2002425 1 View Full Answer Vineeta answered this C3 - Fixes carbon from C02 into a 3 carbon sugar (3-phospoglycerate) C3 plants require less ATP for carbon fixation. Both proccesses were evolutionary devices to allow plants to live in different environments.C4 - Fixes carbon from CO2 into a 4 carbon sugar, C4 plants live in adverse environments, eg in the desert. 0