1.

Question : The biological clock measures the length at each night by the

Answer»

relative AMOUNT of red absorbing and far -red absorbing PHYTOCHROME present at dawn
amount of far -red absorbing phytochrome at dusk
relative amount of red absorbing and far -red absorbing phytochrome at mid day
rate at which are kind of phytochrome is CONVERTED to the other

Answer :A


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