Answer:
The majority of CAM-using plants are found in dry regions with limited water resources. Such plants are able to thrive in environments that would otherwise be far too arid because they are able to keep their stomata closed during the warmest and driest part of the day. This ability lowers the loss of water through evapotranspiration.
Step-by-step explanation:
Crassiacen acid metabolism, also known as CAM photosynthesis, is a carbon fixated [pathway that evolved in some plants as an adaptation to arid conditions that allow a plant to photosynthesize during the day, but only exchange gases at night
C4 plants have dimorphic chloroplast C3 plants do not have dimorphic chloroplast .In these plants vascular bundles are surrounded by bundle sheath of larger parenchymatous cells which in turn surrounded by smaller mesophyll cells .More over the chloroplasts in bundle sheath cells are larger and lack grana whereas in mesophyll cells are smaller and always contain grana called Krantz anatomy .Such structure is not found in C3 plants to carry out two carboxylation reactions .One taking place in chloroplast of mesophyll cells and another in chloroplasts of bundle sheath cells in C4 plants The morphology of C3 plants are different.