Question

plant cells use photosynthesis to make food. plant cells also use cellular respiration to get energy from the food they make. how is cellular respiration different from photosynthesis? (you need to select 2 answers to get full credit)
a photosynthesis produces oxygen, and cellular respiration produces carbon dioxide.
b photosynthesis requires energy from food, and cellular respiration requires energy from the sun.
c photosynthesis requires water, and cellular respiration produces water.

Explanation:

• Option A: Photosynthesis uses \(CO_2\) and \(H_2O\) to produce glucose (\(C_6H_{12}O_6\)) and \(O_2\) (\(6CO_2 + 6H_2O+light

ightarrow C_6H_{12}O_6 + 6O_2\)). Cellular respiration uses \(O_2\) to break down glucose and produce \(CO_2\) (\(C_6H_{12}O_6+6O_2
ightarrow 6CO_2 + 6H_2O+energy\)). So, photosynthesis produces \(O_2\) and cellular respiration produces \(CO_2\).

• Option B: Photosynthesis requires energy from the sun (light energy), while cellular respiration requires energy - rich molecules like glucose (not the sun). So, this option is incorrect.
• Option C: Photosynthesis requires \(H_2O\) (as a reactant: \(6CO_2 + 6H_2O+light

ightarrow C_6H_{12}O_6 + 6O_2\)). Cellular respiration produces \(H_2O\) (as a product: \(C_6H_{12}O_6+6O_2
ightarrow 6CO_2 + 6H_2O+energy\)).

Answer:

A. Photosynthesis produces oxygen, and cellular respiration produces carbon dioxide.
C. Photosynthesis requires water, and cellular respiration produces water.