Multiple choice

At night, the respiratory quotient (R.Q.) in Opuntia will be

  1. zero

  2. one

  3. less than one

  4. more than one
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In CAM plants like Opuntia, organic acids (malic acid) are decarboxylated at night to release CO2 for the Calvin cycle. Because the CO2 is internally sourced and not consumed from the atmosphere, the net gas exchange results in an RQ of zero.

Keep practicing — related questions