Question

Green plants make use of during the process of photosynthesis to prepare their own food.

• A. Carbon dioxide
• B. Oxygen
• C. Nitrogen
• D. Argon

Answer 1

The correct option is A

Carbon dioxide

• Carbon dioxide $\left({\mathrm{CO}}_2\right)$ is used by plants to prepare food during photosynthesis.
• Photosynthesis: The process in which green plants utilise carbon dioxide and water in the presence of sunlight and chlorophyll to produce food and oxygen gas, is called photosynthesis. In this process, food is obtained in the form of glucose which is stored by plants as starch.

$$\begin{gathered} \mathrm{Carbon}\mathrm{dioxide}+\mathrm{Water}\stackrel{\mathrm{Sunlight},\mathrm{Chlorophyll}}{\to }\mathrm{Food}+\mathrm{Oxygen} \\ \left(\mathrm{glucose}\right) \end{gathered}$$

$6{\mathrm{CO}}_2\left(\mathrm{g}\right)+6{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)\stackrel{\mathrm{Sunlight},\mathrm{Chlorophyll}}{\to }{\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6\left(\mathrm{aq}\right)+6{\mathrm{O}}_2\left(\mathrm{g}\right)$

Hence, the correct option is (A). Green plants make use of carbon dioxide during the process of photosynthesis to prepare their own food.