AP BIOLOGY

Detailed explanation-1: -Crassulacean acid metabolism, also known as CAM photosynthesis, is a carbon fixation pathway that evolved in some plants as an adaptation to arid conditions. In a plant using full CAM, the stomata in the leaves remain shut during the day to reduce evapotranspiration, but open at night to collect carbon dioxide (CO2).

Detailed explanation-2: -Their stomata only open at night, when humidity tends to be higher and temperatures are cooler, both factors that reduce water loss from leaves. CAM plants are typically dominant in very hot, dry areas, like deserts.

Detailed explanation-3: -Stomata in CAM plants open during the dark period and close during light period. Behavior of stomata in CAM plants is part of an adaptive mechanism evolved by plants that grow in hot and dry environments to conserve water (Lee and Assmann, 1992).

Detailed explanation-4: -Their stomata remain open during the night. This is done because they tend to minimise the rate of transpiration. It is the characteristic feature of CAM plants. These plants fix carbon dioxide during the night but form sugars only during the day when RuBisCO is active.

Detailed explanation-5: -CAM plants usually close their stomata during the day and open them at night. When the stomata are closed, water loss is prevented by the process of evaporation. This process prevents carbon dioxide gas from entering the plant’s leaves.