Assertion $:-$ There is not a complete one-to-one overlap between the absorption spectrum of chlorophyll $a$ and the action spectrum of photosynthesis.
Reason $:$ Most of the photosynthesis takes place in the blue and red regions of the spectrum,but some photosynthesis does take place at the other wavelengths of the visible spectrum.

• A
  Assertion and reason both are true but reason is not the correct explanation of the assertion
• B
  Only assertion is true
• C
  Both assertion and reason are false
• D
  Assertion and reason both are true and reason is the correct explanation of the assertion