Why is carbon dioxide considered an essential component for plants?

Correct answer: It is a raw material in photosynthesis

The correct answer is A: carbon dioxide is a raw material for photosynthesis. Green plants take in carbon dioxide mainly through tiny openings called stomata in their leaves. Using light energy captured by chlorophyll, they combine carbon dioxide with water to produce glucose, a food molecule. Oxygen is released during this process. The carbon in carbon dioxide becomes part of the organic food made by the plant, so the gas is essential for plant growth and the formation of biomass. B is wrong because carbon dioxide does not cause burning; it generally does not support combustion. C is wrong because carbon dioxide does not give oxygen directly to roots. Plants obtain oxygen for respiration from their surroundings, and roots may receive it through air spaces in soil. D is wrong because carbon dioxide does not turn soil into dust. Memory cue: “CO₂ supplies the carbon for plant food.”