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One scientist cultured Cladophora in a suspension of Azotobacter and illuminated the culture by splitting light through a prism. He observed that bacteria accumulated mainly in the region of:

1. Blue and red light
2. Violet and green light
3. Indigo and green light
4. Orange and yellow light

Correct answer: Blue and red light

Solution

In Engelmann’s experiment, aerobic bacteria moved toward parts of the algal filament releasing the most oxygen. Chlorophyll absorbs blue and red light most effectively, so photosynthesis and oxygen release were greatest there.

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