Wavelengths of which of the following colours of the visible spectrum of light are maximally absorbed by green plants ?

Green plants primarily utilize chlorophyll a and b for photosynthesis, which exhibit distinct absorption peaks within the visible spectrum. Chlorophyll molecules strongly absorb light in the blue (approximately 430-470 nm) and red (approximately 640-680 nm) regions [1][t1][t2]. Specifically, chlorophyll a absorbs most strongly in the violet-blue and orange-red parts of the spectrum [t1]. In contrast, green light is absorbed only weakly and is largely reflected or transmitted, which is why leaves appear green to the human eye [t2][t6][t7]. While other pigments like carotenoids or anthocyanins may absorb different wavelengths, the primary photosynthetic efficiency and maximal absorption in green plants are concentrated in the red and blue wavelengths [1][t6]. Consequently, these two colors are the most effective for driving the photochemical reactions in chloroplasts [1][c2].

Sources

1. [1] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 13: Plant Diversity of India > 13.2.1. Fntensity of light on growth of plants > p. 197