Question

When malic acid is respiratory substrate, the amount of $C{O}_2$ released is

• A. More than $O_2$ consumed
• B. Less than $O_2$ released
• C. Equal to $O_2$ consumed
• D. $C{O}_2$ is not released

Answer 1

The correct option is A More than $O_2$ consumed

R.Q. or Respiratory Quotient is the ratio of volume of CO${}_2$ released to the volume of O${}_2$ consumed for respiration. As R.Q. is greater than 1 for organic acids like malic acid, amount of CO${}_2$ released is more than O${}_2$ consumed.

So the answer is 'More than O${}_2$ consumed'.