Question

How do plants use $C{O_2}$ in photosynthesis?

Answer 1

Hint: Respiration is a series of chemical events that assist all living creatures in synthesising the energy they require to live. This is a biological mechanism in which air passes through the natural atmosphere, as well as the tissues and cells of living creatures.
Desert plants, like other green plants, obtain their nutrition from photosynthesis. Desert plants do not open their pores on leaves for carbon dioxide until the sun sets.

Complete answer:
Plants use carbon dioxide from the atmosphere to store energy in the form of carbohydrates. In the dark process of photosynthesis, carbon dioxide is digested. $C{O_2}$ is used in the carboxylation of ribulose bisphosphate during carbon fixation (RuBP). This is the first stage in the Calvin cycle, and the enzyme RuBisCO catalyses the reaction.It produces two molecules of $3$-phosphoglyceric acid $3PGA$, which is then converted to glucose by a series of processes, and RuBP is regenerated.
Carbon dioxide is the source of carbon for the plant's glucose production. The energy from sunshine is used to mix carbon dioxide with water.
The carbon in glucose is not only needed to produce ATP in cells, but it also makes up the majority of the carbon in plants. After the sugar it produces is converted into other substances, the majority of a plant's mass comes from the carbon it obtains from carbon dioxide.

Note:
A large number of small pores known as stomata or stoma are found on the surface of the leaves of plants. Green plants require greenhouse gas from the air to perform photosynthesis. $C{O_2}$ enters the plant's leaves through the stomata on their surface. A pair of guard cells surround each stomata hole. Only the guard cells have control over the opening and closing of stomatal pores. The guard cells enlarge, become curved, and cause the hole to open as water flows into them.