Assertion: In the daytime, CO₂ generated during respiration is used up for photosynthesis. Reason: There is no CO₂ release during the day. Which of the following is correct?
1) Both assertion and reason are true and reason is the correct explanation of the assertion.
2) Both assertion and reason are true but reason is not the correct explanation of the assertion.
3) Assertion is true but reason is false.
4) Assertion is false but reason is true.