Question

which is considered to be a \waste\ product that plants produce?
sunlight
carbon dioxide
water
oxygen

Explanation:

Plants perform photosynthesis, using sunlight, carbon dioxide, and water to make glucose (their food). Oxygen is a byproduct of this process that plants do not use for their own core metabolic needs, so it is released as waste. Sunlight is an input, not a product. Carbon dioxide is taken in by plants, not produced as waste. Water is both an input and can be lost via transpiration, but it is not a waste product of photosynthesis.

Answer:

oxygen