Answer :
Final answer:
In the geranium leaf photosynthesis experiment, the blue and red filters would allow photosynthesis to occur, as chlorophyll in plants absorbs light most effectively at these wavelengths.
Explanation:
The filters that allowed for photosynthesis to take place in the geranium leaf experiment are those that correspond with the wavelengths of light useful to the plant, particularly in the blue and red regions of the light spectrum. Given the options of blue, none, green, and red, the blue and red filters would support photosynthesis, as these are the wavelengths that chlorophyll a and b absorb most effectively. Green light is mostly reflected by plants, which is why they appear green to our eyes, and would not be as effective for photosynthesis. This correlates with the absorption spectra for chlorophyll a, chlorophyll b, and other pigments like carotenoids that show specific patterns of light absorption, with peaks in the blue and red regions.
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