NEET BIOLOGY

Detailed explanation-1: -In the blue and red light spectrums, photosynthesis is most efficient: The blue and red light spectrum is most efficient in photosynthesis because both photosystems (PS I and PS II) absorb light with wavelengths in the red range (680 and 700 nm, respectively).

Detailed explanation-2: -The best wavelengths of visible light for photosynthesis fall within the blue range (425–450 nm) and red range (600–700 nm). Therefore, the best light sources for photosynthesis should ideally emit light in the blue and red ranges.

Detailed explanation-3: -In contrast, blue light is considered equally effective as green or red light at driving photosynthesis. Thus, while blue light can appear somewhat dim to us, it has high energy and is useful for plant growth applications.

Detailed explanation-4: -For example, blue (B) and red (R) light are the most effectively utilized wavelengths during plant photosynthesis because the absorption spectra of the photosynthetic pigments mainly focus on the B (400–500 nm) and R (600–700 nm) light spectra.

Detailed explanation-5: -Blue and red lights differently regulate leaf photosynthesis. Previous studies indicated that plants under blue light generally exhibit better photosynthetic characteristics than those under red light.