Question

why does the rate of respiration fall of rapidly when the oxygen concentration goes below 5%​

Answer 1

Answer:

because it needs energy for respiration and if the o2 concentration. goes below 5% there will be a scarcely of energy

Answer 2

Answer:

Under circumstances where no oxygen is present, like in poorly draining soil, anaerobic respiration (fermentation) occurs. Anaerobic respiration results in carbon dioxide, some energy, and ethanol. This type of respiration is also used to create alcohols.

The rate of respiration for most plants peaks around the normal oxygen level in the atmosphere.