Class VIII

Breathing involves the movement of the______ and the rib cage.
  1. Diaphragm
  2. Lungs
  3. Nose
  4. None of these
Smoking causes
  1. Stomach cancer
  2. Lung cancer
  3. Nausea
  4. All of these
When we breathe out, exhaled air turns lime water into _ due to presence of _ . 
  1. Orange, oxygen 
  2. Milky, oxygen 
  3. Milky, carbon dioxide 
  4. Milky, carbon monoxide 
Cellular respiration takes place in the ____ of all organisms.
  1. Cells
  2. Tissues
  3. Sand
  4. None of these 
When on land, frogs respire through
  1. Gills
  2. Skin
  3. Spiracles
  4. Lungs
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