Question
Biology Question on Photosynthesis in higher plants
Which pigment system is inactivated in red drop?
A
PS-I and PS-II
B
PS-I
C
PS-11
D
none of the above.
Answer
PS-11
Explanation
Solution
Emerson and Lewis worked on Chlorel/a and Calculated the quantum yield for different wavelengths. Emerson observed that rate of photosynthesis declines in the red region of the spectrum. This decline in 1 photosynthesis is called 'Red drop'. It was observed that the quantum yield falls when the light of wavelengths more than 680 or 690 nm are supplied. As the PS-II (P-680) is driven by red light, so it remains ; inactive during red drop.