Question

Which one of these materials is not needed by green plants to make food?

• A. Light
• B. CO₂
• C. H₂O
• D. Starch

Answer 1

The correct option is D

Starch

The correct option is D.

Explanation of the correct option:

• Starch is a polysaccharide is made up of multiple glucose molecules.
• Amylose and amylopectin are the types of polysaccharides in starch.
• The starch is a storage molecule and does not have any role in maintaining the structure.
• The plants use carbon dioxide, water and sunlight to prepare food.

Explanation of the incorrect options:

Option A:

• Light is an important requirement for plants to prepare their own food.
• It is used to carry out photosynthesis.

Option B:

• Carbon dioxide is fixed by the plants to produce glucose which is the food for the plants.

Option C:

• Water is used by the plants during photosynthesis to give oxygen and glucose as the products.

Final answer: Starch is not needed by green plants to make their own food.