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PROBLEMS IN PHOTOSYNTHESIS 



requirement to 17 (efficiency 15%). Further addition of blue-green light 

 brings the quantum requirement down to 3.2 (efficiency 81%). Removal 

 again increases the quantum requirement to 12.2 (efficiency 21%). This 

 experiment clearly shows that in the absence of blue-green light efficiency is 

 very low. After its addition, very good efficiencies are immediately obtained. 

 The intensity of the measured red light was 16.7 /^l quanta/min, while the 

 intensity of the added blue-green light amounted to 0.3 ^1 quanta/min 

 only. The values of v were calculated with the aid of equation 27. The 

 results of two experiments are shown in Tables 13 and 14. The figures 

 clearly show that without blue-green light quantum requirement values 

 increase and, in consequence, the efficiency values decrease. 



TABLE 13 

 The effect of blue-green light on cuantum requirement and efficiency (measured red light) 



TABLE 14 

 The effect of blue-green light on quantum requirement and efficiency (measured green light) 



