Question

1. which gas is taken in from the atmosphere for cellular respiration?

a) carbon dioxide
b) nitrogen
c) methane
d) oxygen

Explanation:

Cellular respiration is a process where cells break down glucose to release energy. The general equation for aerobic cellular respiration is \(C_6H_{12}O_6+6O_2
ightarrow6CO_2 + 6H_2O+\text{Energy}\). From this equation, we can see that oxygen (\(O_2\)) is taken in from the atmosphere. Carbon dioxide (\(CO_2\)) is a by - product (eliminating option A). Nitrogen (\(N_2\)) is not directly involved in the main reaction of aerobic cellular respiration (eliminating option B). Methane (\(CH_4\)) is not a gas taken in for typical cellular respiration in most organisms (eliminating option C).

Answer:

D. Oxygen