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The entry and exit of gasses in plants is through small pores called stomata located on the underside of leaves. Carbon dioxide, the gas required for the Calvin cycle , is not a very abundant gas in nature. Plants that normally live in dry, hot climates have adapted different ways of initially fixing CO 2 prior to its entering the Calvin cycle. These pathways of carbon fixation, know as the C 4 and the CAM pathways, take place in the cytoplasm of the cell. The C 4 pathway is designed to efficiently fix CO 2 at low concentrations and plants that use this pathway are known as C 4 plants. This occurs in cells called mesophyll cells.