Are tomatoes C3 or C4 plants?

C3 and C4 are two different photosynthetic pathways used by plants. C3 plants are those that use the Calvin cycle to fix carbon dioxide, while C4 plants use the C4 cycle. The main difference between the two cycles is the way in which they fix carbon dioxide. In C3 plants, the first product of carbon fixation is a three-carbon compound called 3-phosphoglycerate (3-PGA), while in C4 plants, the first product is a four-carbon compound called oxaloacetate (OAA).

Tomatoes are C3 plants because they use the Calvin cycle to fix carbon dioxide. This means that the first product of carbon fixation in tomatoes is 3-PGA.