Which type of light is associated with high photosynthetic activity?

Red light is associated with high photosynthetic activity due to its effectiveness in driving the photosynthesis process within plants. Plants contain chlorophyll, the green pigment responsible for capturing light energy, which primarily absorbs light in the red (around 640-680 nm) and blue (around 430-450 nm) wavelengths. While both blue and red light are important for plant growth, red light plays a crucial role in promoting photosynthesis because it is highly effective in energizing the most impactful processes in the chloroplasts, leading to increased rates of glucose production and overall plant growth.

Green light, on the other hand, is primarily reflected by leaves, which is why plants appear green. It is not as effective in stimulating photosynthesis. Yellow light has similar limitations, as it does not contribute significantly to the photosynthetic process compared to the more effective blue and red wavelengths. Consequently, red light is essential for maximizing photosynthetic efficiency in plants.