The correct answer is D. CO2.
Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar. The chemical equation for photosynthesis is:
6CO2 + 6H2O + light energy â C6H12O6 + 6O2
As you can see from the equation, carbon dioxide is a reactant in photosynthesis. It is used by plants to create glucose, a type of sugar. Glucose is then used by plants for energy or to build new plant material.
Oxygen is a product of photosynthesis. It is released into the atmosphere as a waste product.
Water is also a reactant in photosynthesis. It is used by plants to split apart the carbon dioxide molecules.
Light energy is also required for photosynthesis. It is used by plants to split apart the water molecules.
The other options are not necessary for photosynthesis.
- Option A, oxygen, is a product of photosynthesis. It is not required for the process to occur.
- Option B, carbon monoxide, is a poisonous gas. It would not be beneficial for plants to use in photosynthesis.
- Option C, nitrogen, is an inert gas. It does not react with other substances and would not be useful for photosynthesis.