Name the primary pigment and the two common accessory pigments involved in photosynthesis.

• A. Primary pigment is chlorophyll a; accessory pigments include chlorophyll b and carotenoids.
• B. Primary pigment is chlorophyll b; accessory pigments are chlorophyll a and xanthophyll.
• C. Primary pigment is carotenoids; accessory pigments are chlorophyll a and b.
• D. Primary pigment is chlorophyll c; accessory pigments are chlorophyll d and e.

Answer: (A)

In photosynthesis, one pigment acts as the main energy driver, while others help broaden the range of light energy that can be captured. The primary pigment is chlorophyll a, which is the pigment that directly participates in converting light energy into chemical energy during the light reactions. The two common accessory pigments involved are chlorophyll b and carotenoids.

Chlorophyll b expands the range of light wavelengths that can be utilized by absorbing blue light and transferring that energy to chlorophyll a. Carotenoids, including various carotenoids like beta-carotene and xanthophylls, absorb light in other regions of the spectrum and help protect the photosynthetic apparatus from damage by excess light. Together, chlorophyll a, chlorophyll b, and carotenoids enable plants to harvest light more efficiently and guard against photooxidative stress.