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MCQ 206: Lives of organisms in ecosystem become threatened due to:

  1. urbanization
  2. industrialization
  3. introduction of toxics in ecosystem
  4. rapid housing

MCQ 207: Blood in pulmonary arteries is at a lower pressure than blood in aorta allowing:

  1. tricuspid valve to shut
  2. bicuspid valve to shut
  3. gaseous exchange to effectively take place in lungs
  4. semi lunar valves to prevent backflow of blood

MCQ 208: When the heart relaxes,:

  1. person respires
  2. peristalsis movements occur
  3. bile is produced
  4. the heart gets filled with blood

MCQ 209: Vertebral column faces the:

  1. concave side of kidneys
  2. convex side of kidneys
  3. posterior side of kidneys
  4. inferior side of the kidney

MCQ 210: At intervals, along the length, the spinal cord:

  1. has myelin sheath
  2. has grey matter
  3. gives off spinal nerves
  4. branches off into dendrites

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