CBSE  /  Class 7  /  Science  /  Respiration in Organisms

  • 1. 
    Sometimes when we do heavy exercise, anaerobic respiration takes place in our muscle cells. What is produced during this process?

  • alcohol and lactic acid
  • alcohol and CO
  • lactic acid and CO
  • lactic acid only

  • 2. 
    Yeast is used in wine and beer industries because it respires.

  • aerobically producing oxygen
  • aerobically producing alcohol
  • anaerobically producing alcohol
  • anaerobically producing CO

  • 3. 
    During the process of exhalation, the ribs move

  • down and inwards
  • up and inwards
  • down and outwards
  • up and outward

  • 4. 
    Which are the gases involved in breathing?

  • O and NO
  • O and SO
  • O and O
  • O and CO

  • 5. 
    Name the organ of the body in which the blood is oxygenated.

  • Heart
  • Lungs
  • Lever
  • Pancreas

  • 6. 
    After heavy exercise, due to the accumulation of which substance we get muscle cramps ?

  • Malaic acid
  • Fumaric acid
  • Lipoic acid
  • Lactic acid

  • 7. 
    Yeasts are used in

  • wine and beer industry
  • bakery
  • in both
  • none of these

  • 8. 
    In the following figure of respiratory system organs labelled by 1 and 2 are respectively:

  • Tracheae, Lungs
  • Lungs, Tracheae
  • Nasal cavity, Lungs
  • Lungs, Nasal cavity

  • 9. 
    Breathing rate in human beings in normal condition is

  • 12-15 times in a minute
  • 15-18 times in a minute
  • 18-22 times in a minute
  • 22-25 times in a minute
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