Photosynthesis is a process used by plants to create sugar. During photosynthesis plants combine sunlight, carbon dioxide, and water to make glucose, C6H12O6. Oxygen gas is also produced as a byproduct. Which of these is the best evidence that photosynthesis is a chemical reaction?

Question

A Glucose is made up of more than one elementGlucose is made up of more than one element
B Carbon dioxide is presentCarbon dioxide is present
C A new substance, glucose, is madeA new substance, glucose, is made
D A liquid and a gas are combined with energy from the sun

Answer 1

The best evidence that photosynthesis is a chemical reaction is:

C A new substance, glucose, is made.

This indicates that a transformation has occurred, which is characteristic of a chemical reaction where reactants are converted into different products. In this case, carbon dioxide and water are transformed into glucose and oxygen.