Question

The gas used in photosynthesis is

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

Answer 1

The correct option is C

Carbon dioxide

The correct option is C

Explanation for the correct option

1. Photosynthesis is the process of synthesizing glucose by autotrophs in the presence of sunlight.
2. Green plants are an example of autotrophs that perform photosynthesis in their leaves.
3. The raw materials for photosynthesis are water and carbon dioxide gas.

$6{\mathrm{CO}}_2(\mathrm{carbon}\mathrm{dioxide})+6{\mathrm{H}}_2\mathrm{O}\left(\mathrm{water}\right)\underset{}{\overset{\mathrm{Sunlight}}{\to }}{\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6\left(\mathrm{glucose}\right)+6{\mathrm{O}}_2\left(\mathrm{oxygen}\right)$

Explanation for incorrect options

Option A

Plants release oxygen as the by-product of photosynthesis.

Option B

Nitrogen is a component of proteins and has no direct role in photosynthesis.

Option D

Hydrogen is the component of the water that is used and released during photosynthesis.

Carbon dioxide gas is used in photosynthesis.