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Photosynthetically active radiation is represented by the range of wavelength of

1. 340-450 nm
2. 400-700 nm
3. 500-600 nm
4. 400-950 nm

Correct answer: 400-700 nm

Solution

Photosynthetically active radiation (PAR) is the portion of light that plants can use for photosynthesis, which lies in the visible range from 400 to 700 nm. This band includes the wavelengths most strongly absorbed by chlorophyll.

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