Succulents are known to keep their stomata closed during the day to check transpiration. How do they meet their photosynthetic CO2 requirements?
Answer -
succulents plants keep their stomata closed during the daytime. However, this also restricts the entry of carbon dioxide. In order to ensure the presence of carbon dioxide within the plant body, the succulent plants have adopted a special method for carbon dioxide supply during the daytime.
The method allows the plants to fix carbon dioxide in the form of malic acid during the night times.