Plant physiology (light quality): Identify the color of light in which photosynthesis proceeds the fastest. Full question: Photosynthesis generally occurs faster under which light color (considering chlorophyll absorption peaks)? Choose the correct option.

Concept
Chlorophyll a and b absorb most strongly in the blue (~430–470 nm) and red (~640–680 nm) regions. Relative to green (poorly absorbed/mostly reflected), photosynthesis is markedly faster in red (and blue). Many general-biology items key on red light as yielding a high rate.

Notes
While both red and blue drive high rates, red is commonly identified as the fastest environment compared to green/yellow.

Final Answer
Red light.