Engelmann-s experiment with Spirogyra demonstrated that The full spectrum of sunlight is needed photosynthesisOnly red wavelengths are effective in causing photosynthesisOnly Blue wavelengths are effectiveBoth blue and red wavelengths are effective

Question

Toppr Admin · Accepted Answer

Theodor Wilhelm Engelmann was a German botanist, physiologist, microbiologist, university professor and musician, whose 1882 experiment measured the effects of different colours of light on photosynthetic activity and showed that the conversion of light energy to chemical energy took place in the chloroplast. Both blue and red wavelength are effective because the amount of oxygen released was found to be maximum in blue and red absorption bands of the chlorophyll.
So, the correct answer is 'Both blue and red wavelengths are effective'

Engelmann's experiment with Spirogyra demonstrated that The full spectrum of sunlight is needed for photosynthesisOnly red wavelengths are effective in causing photosynthesisOnly Blue wavelengths are effectiveBoth blue and red wavelengths are effective

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