Which photosynthetic pigment absorbs light mostly in the blue and red regions of the spectrum and is present in all oxygenic photosynthetic organisms?

💡 Solution & Explanation

Chlorophyll a is the universal primary photosynthetic pigment found in all oxygenic phototrophs, absorbing light predominantly in the blue and red wavelengths while reflecting green light. Accessory pigments like carotenoids or bacteriochlorophyll serve distinct light-harvesting or anoxygenic functions.