AIIMS AIIMS Solved Paper-2010

  • question_answer
    Sinking of zooplankton during the day and rising to the surface at night is an example of

    A)  circinal rhythm                

    B)  circadian rhythm            

    C)  tidal rhythm                     

    D)  None of these

    Correct Answer: B

    Solution :

    Circadian rhythm or diurnal rhythm is any 24 hour periodicity in the behaviour or physiology of animals or plants. Examples are the sleep/activity cycle in many animals and the growth movements of plants. Circadian rhythms are generally controlled by biological clocks.


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