Question

A reduction in the quantity of oxygen evolution during photosynthesis may be observed at

• A. Light with wave length 560 nm
• B. Light with wave length less than 360 nm
• C. Light with wave length less than 680 nm
• D. Light with wave length more than 680 nm

Answer 1

The correct option is B

Light with wave length less than 360 nm

The photosynthetically active radiation (PAR) is the radiation range in which photosynthesis can occur. PAR ranges from 400 to 700 nm. Wavelengths below 360 nm do not fall under PAR, and hence, photosynthesis cannot occur, thus resulting in reduction in the quantity of oxygen evolved during photosynthesis.