Question

Why is photosynthesis a chemical reaction?

A because new substances are formed
B. because an input of energy is required
C. because the reactants are compounds
D. because the products include an element

Answer 1

A. Because a new substance is formed.

Answer 2

Answer: A.

Explanation: A chemical reaction is a chemical change that occurs when two or more substances combine to form a new substance . Photosynthesis turns carbon dioxide and water into oxygen and carbohydrates, therefore a chemical change occurs.