Correct answer: (B) 400 ~nm-700 ~nm. Light is the visible part of electromagnetic radiations. Sunlight or solar radiations reaching the earth have wavelength between 300 ~nm to 2600 ~nm . Part of the spectrum used in photosynthesis has a wavelength between 400-700 ~nm . It is called photosynthetically active radiation (PAR).

Q18 / 180 · AIIMS 2007 · Botany

What is PAR range?

A
\(200 \mathrm{~nm}-800 \mathrm{~nm}\)
Correct answer
B
\(400 \mathrm{~nm}-700 \mathrm{~nm}\)
C
\(350 \mathrm{~nm}-550 \mathrm{~nm}\)
D
\(600 \mathrm{~nm}-100 \mathrm{~nm}\)

Solution

Light is the visible part of electromagnetic radiations. Sunlight or solar radiations reaching the earth have wavelength between \(300 \mathrm{~nm}\) to \(2600 \mathrm{~nm}\). Part of the spectrum used in photosynthesis has a wavelength between \(400-700 \mathrm{~nm}\). It is called photosynthetically active radiation (PAR).

Hence, the correct answer is option: 'B'.

What is PAR range?

Solution

More Photosynthesis in Higher Plants Questions