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Breathing and Exchange of Gases — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYBreathing and Exchange of Gases1 Mark
MCQ
Lungs are an important organ for excretion of:
  • A
    Water.
  • B
    Urea.
  • C
    Oxygen.
  • D
    Carbon dioxide.
✓

Answer

  1. Carbon dioxide.

Explanation:

Lungs are the respiratory organ, they help in removal of carbon dioxide from our body through the air that we respire. Carbon dioxide is formed during oxidation of food. It is the waste product and of no use of our body. It is carried out to the lungs by blood. So, it may also be considered as an organ that is involved in excretion. 

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