LabBench Activity

Transpiration and Photosynthesis

By now you should have the basic equation for photosynthesis fixed in your memory! Just to be sure, type it in here:

A leaf needs carbon dioxide and water for photosynthesis. For carbon dioxide to enter, the stomata on the surface of the leaf must be open. As you have seen, transpiration draws water from the roots into the leaf mesophyll. However, the plant must not lose so much water during transpiration that it wilts. The plant must strike a balance between conserving water and bringing in sufficient amounts of CO2 for photosynthesis.