Solution:
Solution
In a CAM plant, the stomata in the leaves remain shut during the day to reduce evapotranspiration but open at night to collect carbon dioxide. The CO2? is stored as the four-carbon acid malate and then used during photosynthesis during the day.
The pre-collected CO2? is concentrated around the enzyme RuBisCO, increasing photosynthetic efficiency. Acidification during night stores CO2? and de-acidification supplies CO2? to the plant for performing photosynthesis during the day time when stromata are closed.
Thus, light acidification and de-acidification can be observed in CAM plants and not in C3?, C4 plants.