Question

Which of the following is not the product of respiration?
A. Carbon Dioxide
B. Water
C. Oxygen
D. ATP

Answer 1

Hint: According to physiology, respiration is the movement of oxygen from the outside environment to the cells within tissues, as well as the removal of carbon dioxide in the opposite direction.

Complete answer:
Respiration is the process of producing energy in the form of ATP through the oxidation of a simple sugar, such as glucose. In cells, glucose is produced by the breakdown of more complex carbohydrates. This glucose is then converted in the cell's cytoplasm into the three-carbon compound pyruvate, which then enters the mitochondria, where respiration occurs, and is referred to as cellular respiration.

Cellular respiration can take place either aerobically (with the use of oxygen) or anaerobically (without the use of oxygen) (without oxygen).
During aerobic cellular respiration, glucose reacts with oxygen to form ATP, which the cell can use. As a byproduct, carbon dioxide and water are produced.

The general equation for aerobic cellular respiration is as follows:
$C_{6}H_{12}O_{6}+6O_{2}\rightarrow 6CO_{2}+6H_{2}O+ATP$

Both oxygen and glucose are cellular respiration reactants. When an organism breathes, oxygen enters the body. When an organism eats, glucose enters the body.

Cellular respiration produces carbon dioxide and water as byproducts. Carbon dioxide is transported from your mitochondria to your red blood cells, then back to your lungs to be exhaled. ATP is produced as a byproduct of the process. When one molecule of glucose is broken down, a total of 36 or 38 molecules of ATP can be produced. This is only possible in the presence of oxygen.

Oxygen is not the product of respiration.

Note: One acre of trees produces enough oxygen to sustain the lives of 18 people for one year. Every year, one tree absorbs about 13 pounds of $CO_2$. 2.6 tonnes of $CO_2$ are absorbed by one acre of trees. That is enough to offset the $CO_2$ emissions produced by driving a car for 26,000 miles.