CAM plants have adapted to arid environments by closing their stomata during the day. However, photosynthesis still occurs. This is because . View Available Hint(s) CAM plants have adapted to arid environments by closing their stomata during the day. However, photosynthesis still occurs. This is because . some CO2 leaks through the closed stomata photosynthesis occurs at night CO2 is fixed at night when the stomata are open CO2 is fixed in the bundle-sheath cells