Which pigment is the primary pigment involved in photosynthesis?

Which pigment is the primary pigment involved in photosynthesis?

• A. Chlorophyll a
• B. Chlorophyll b
• C. Carotene
• D. Anthocyanin

Answer: (A)

Chlorophyll a is the pigment directly responsible for capturing light energy in the light-dependent reactions of photosynthesis. It participates in the photochemical events that start the electron flow through the photosystems, driving the synthesis of ATP and NADPH used in the Calvin cycle. Because of this central role, it’s considered the primary pigment. Other pigments, like chlorophyll b, mainly broaden the light-absorbing range and transfer that energy to chlorophyll a, while carotene and other carotenoids help with additional absorption and protecting the photosynthetic apparatus, but they do not drive the primary light reactions. Anthocyanin is not involved in photosynthesis; it mostly contributes to coloration in plants.

Chlorophyll a is the pigment directly responsible for capturing light energy in the light-dependent reactions of photosynthesis. It participates in the photochemical events that start the electron flow through the photosystems, driving the synthesis of ATP and NADPH used in the Calvin cycle. Because of this central role, it’s considered the primary pigment. Other pigments, like chlorophyll b, mainly broaden the light-absorbing range and transfer that energy to chlorophyll a, while carotene and other carotenoids help with additional absorption and protecting the photosynthetic apparatus, but they do not drive the primary light reactions. Anthocyanin is not involved in photosynthesis; it mostly contributes to coloration in plants.