why it is not red light
Q.11. Photosynthesis is most active in
(1) Sun light
(2) Yellow light
(3) Red light
(4) Green light

Dear student, 
Please find below the solution to the asked query        

Photosynthesis takes place fastest in white light or sunlight  because plants readily absorb it. It contains all the seven colours of spectrum.         

If the lights are separate (then after white light), rate of photosynthesis is highest in blue light. This is because blue light has higher absorbance and also higher energy than other light colour such as red. Blue light being highly energetic light causes much excitation. After blue comes red.

Hence. option (1) is correct and not (3)

Hope this information will clear your doubts about the topic.   
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Plants are green because of a green pigment called chlorophyll. This pigment absorbs red light the best, and converts the light into energy that it uses for metabolism. ... Photosynthesis occurs when pigments (chlorophyll) molecules in the plant cell absorb light photons and transfer them around to create chemical energy.
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