which part of the leaf describes the location where photosynthesis takes place?
Singular is stoma] (mostly on the underside of the leaf) allow gas exchange; since a lot of water vapour can be lost through the stomata they only open for photosynthesis in daylight; at night they close to reduce loss of water vapour. 1  Page. 2  1. 3  2. 4  3. 5  4.