Plant pigments absorb light only in the wavelength range:
A100 nm to 200 nm
B400 nm to 700 nm
C800 nm to 1100 nm
D1200 nm to 1500 nm
Answer & Solution
Correct answer: B. 400 nm to 700 nm
1. Wavelengths below red carry too little energy to excite an orbital electron.
2. Wavelengths above blue carry so much energy they tear molecules apart, called bleaching.
3. Plant pigment molecules absorb only light in the wavelength range of 700 nm to 400 nm.
4. Plant physiologists refer to this range for plants as photosynthetically active radiation.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 8 'Photosynthesis', sections 8.1-8.3_
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