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The biological clock measures the length...

The biological clock measures the length at each night by the

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

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The correct Answer is:
A
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