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  4. A first action spectrum of photosynthesis was described by

Q. A first action spectrum of photosynthesis was described by

 1481  145 Photosynthesis in Higher Plants Report Error

Solution:

• He split light into its spectral components (VIBGYOR) by using a prism and then illuminated a green alga (Cladophora) placed in the suspension of aerobic bacteria. The bacteria were used to detect the sites of evolution.
• Engelmann observed that bacteria accumulated mainly in the region of blue and red light of split spectrum. A first action spectrum of PHS was thus described.
• Algae often float on surface of water during day but sink down during night due to evolution and trapping of oxygen bubbles during the day in their PHS.