Question

the diagram at the top of this article demonstrates that-
photosynthesis gives off water and carbon dioxide.
photosynthesis uses energy to make oxygen and sugars.
cellular respiration gives off atp as a waste product.
cellular respiration needs water and carbon dioxide.

Explanation:

Photosynthesis is the process by which plants use light energy (from the sun), carbon dioxide (\(CO_2\)) and water (\(H_2O\)) to produce glucose (a sugar, \(C_6H_{12}O_6\)) and oxygen (\(O_2\)). The general equation for photosynthesis is \(6CO_2 + 6H_2O+ \text{light energy}
ightarrow C_6H_{12}O_6+6O_2\).

• Option 1: Photosynthesis consumes water and carbon dioxide, not gives them off.
• Option 2: Photosynthesis uses light energy to make oxygen (\(O_2\)) and sugars (e.g., glucose \(C_6H_{12}O_6\)), which is correct.
• Option 3: ATP (adenosine - tri - phosphate) is an energy - carrying molecule produced in cellular respiration (and other processes), but it is not a waste product. Waste products of cellular respiration are carbon dioxide and water (in aerobic respiration).
• Option 4: Cellular respiration (in the case of aerobic respiration) needs oxygen (\(O_2\)) and glucose (\(C_6H_{12}O_6\)), and produces carbon dioxide (\(CO_2\)) and water (\(H_2O\)).

Answer:

photosynthesis uses energy to make oxygen and sugars.