STANDARD Botany Light Spectrum and Photosynthesis MCQ Question
Engelmann's experiment with Spirogyra demonstrated that
The full spectrum of sunlight is needed for photosynthesis
Only red wavelengths are effective in causing photosynthesis
Only blue wavelengths are effective
Both blue and red wavelengths are effective
Correct Answer
Detailed Explanation
Engelmann's experiment demonstrated that both blue and red wavelengths of light are effective in driving photosynthesis, as evidenced by the movement of bacteria towards these regions.
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