Digital ACT Science Practice Question #1828

Both chlorophyll a and chlorophyll b exhibit their lowest absorption at 550 nm. This explains why: Experiment Context (Spectrophotometric Absorption of Photosynthetic Pigments): Biochemists purified chlorophyll a and chlorophyll b and recorded optical absorbance across the visible light spectrum (400 to 700 nm): Table 25: - 430 nm (Violet): Chlorophyll a Absorbance = 0.95; Chlorophyll b Absorbance = 0.35 - 455 nm (Blue): Chlorophyll a Absorbance = 0.30; Chlorophyll b Absorbance = 0.98 - 550 nm (Green): Chlorophyll a Absorbance = 0.04; Chlorophyll b Absorbance = 0.05 - 640 nm (Orange-Red): Chlorophyll a Absorbance = 0.22; Chlorophyll b Absorbance = 0.75 - 660 nm (Pure Red): Chlorophyll a Absorbance = 0.88; Chlorophyll b Absorbance = 0.20