Exam preparation MCQs with answers

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“lub” sound is produced after _________ ?
  • (A)  The ventricles are fully contracted
  • (B)  The ventricles start to relax
  • (C)  The bicuspid and tricuspid valves suddenly close
  • (D)  The semilunar valves are closed
BOD refers to the __________?
  • (A)  Bidding of Dermatology
  • (B)  Binding of Dirt
  • (C)  Biochemical occupied Date
  • (D)  Biochemical Oxygen demand
What is hibernation and aestivation________?
  • (A)  Thermal adaptation shown by animals
  • (B)   wind adaptation shown by animals
  • (C)   adaptation of animals to escape from predators
  • (D)  none of the above