A) relative amount of red absorbing and far-red absorbing phytochrome present at dawn
B) amount of far-red absorbing phytochrome at dusk
C) relative amount of red absorbing and far red absorbing phytochrome at mid day
D) rate at which are kind of phytochrome is converted to the other
Correct Answer: A
Solution :
The biological clock measures the length of each night by the relative amount at red absorbing and far-red absorbing phytochrome present at dawn.
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