Question

1. during photosynthesis plants produce a waste product that they dont need for photosynthesis. which one of the following is the waste molecule they make?

○ oxygen
○ carbon dioxide
○ water
○ glucose

Explanation:

Photosynthesis in plants uses carbon dioxide and water, with light energy, to produce glucose (for energy/storage) and oxygen. Oxygen is a by - product (waste) as plants don't need it for their own photosynthetic - derived energy use (they use glucose and oxygen in respiration, but oxygen from photosynthesis is excess and released). Glucose is needed, water is a reactant, and carbon dioxide is a reactant. So the waste molecule is oxygen.

Answer:

A. Oxygen