Solution: During the day, succulent plants keep their stomata closed. This, however, limits the amount of carbon dioxide that can enter the system. Succulent plants have developed a particular way of supplying carbon dioxide throughout the daytime in order to assure the presence of carbon dioxide within the plant body. These plants have designed a special approach for ensuring the daily supply of carbon dioxide. These plants fix carbon dioxide at night in the form of malic acid.

During the night, the approach permits the plants to fix carbon dioxide in the form of malic acid.