What is the significance of Engelmann’s experiment with Cladophora and aerobic bacteria?

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Question

What is the significance of Engelmann’s experiment with Cladophora and aerobic bacteria?

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It showed that chlorophyll is necessary for photosynthesis It demonstrated the wavelengths of light most effective for photosynthesis Correct It proved that CO₂ is used in photosynthesis It identified oxygen as a product of photosynthesis

Explanation

Engelmann’s experiment demonstrated that photosynthesis occurs most efficiently in red and blue light by observing the movement of aerobic bacteria toward oxygen-rich regions.

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