AIIMS 2015 Biology Question Paper for free online practice with solutions

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Question : 22 of 60

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The biological clock measures the length at each night by the

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

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