Multiple choice

Which of the following is a reactant in aerobic respiration?

  1. CO2

  2. O2

  3. H2O

  4. C6H12O6

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Oxygen is a reactant in aerobic respiration. Oxygen enters the cell by diffusion. It is first transported to the cells via the red corpuscles. These contain haemoglobin, a transporter protein that carries oxygen to the cells of the body.