Final answer:
Light absorption and the rate of photosynthesis have a direct proportional relationship for wavelengths between 410nm and 500nm, part of the photosynthetically active radiation spectrum vital for photosynthesis.
Step-by-step explanation:
The relationship between light absorption and the rate of photosynthesis for wavelengths of light between 410nm and 500nm is observed to be directly proportional. This range falls within the photosynthetically active radiation spectrum, which is between 400nm and 700nm, the range at which plant pigments such as chlorophyll can absorb light. The absorption of light by these pigments is crucial for photosynthesis as it initiates the process by raising electrons to a higher energy state, thereby allowing the synthesis of organic molecules from carbon dioxide and water.
Specifically, wavelengths in the blue range (~450nm) are highly effective for photosynthesis, as they match the peak absorption range of chlorophyll pigments, which are central to the photosynthetic process. Therefore, when the plant pigment molecules absorb light within this range, there is an increase in the rate of photosynthesis, demonstrating a direct proportional relationship.