Question

Plants perform both photosynthesis and cellular respiration. Based on information from Lab 7, how will respiration affect oxygen levels?
a
Oxygen levels will increase due to cellular respiration.

b
Oxygen levels will decrease due to cellular respiration.

c
Oxygen levels will remain the same despite cellular respiration.

d
Oxygen levels will increase sharply at first, but then decrease due to cellular respiration

Answer 1

Cellular respiration will affect the oxygen levels by decreasing it.

CELLULAR RESPIRATION:

• Cellular respiration is the process by which living organisms obtain energy (ATP) by breaking down food molecules in their cells.

• Cellular respiration can either occur aerobically (with oxygen) or anaerobically (without oxygen). Aerobic cellular respiration uses oxygen to break down glucose molecules to form carbon dioxide and water as follows:

C6H12O6 + 6O2 → 6CO2 + 6H2O

• Based on the equation above, oxygen is a reactant meaning that it is used up during the cellular respiration process. Therefore, oxygen levels will decrease due to cellular respiration.

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