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  • Evolution of oxygen during photosynthesis was discovered byOption: 1 Joseph priestleyOption: 2

Evolution of oxygen during photosynthesis was discovered by

Option: 1

Joseph priestley


Option: 2

Von Neil


Option: 3

Ingenhousz


Option: 4

Engelmann


Answers (1)

best_answer
 

Exp. 4

  • T.W Engelmann used a prism and he split light into its spectral components and then illuminated a green alga, Cladophora, placed in a suspension of aerobic bacteria. 
  • The bacteria were used to detect the sites of O2 evolution. 
  • He observed that the bacteria accumulated mainly in the region of blue and red light of the split spectrum. 
  • A first action spectrum of photosynthesis was thus described. 
  • It resembles roughly the absorption spectra of chlorophyll a and b.

Ingenhousz in an elegant experiment with an aquatic plant showed that in bright sunlight, small bubbles were formed around the green parts while in the dark they did not. Later he identified these bubbles to be of oxygen. Hence, the correct answer is option c.

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