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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
Asthma is characterised by:
  • A
    Spasm in bronchial muscle
  • B
    Alveolar wall degradation
  • C
    Pain in lungs
  • D
    Damage in diaphragm
✓

Answer

  1. Spasm in bronchial muscle

Explanation:

Asthma is a chronic lung condition. In asthma, the bronchi swell and muscles of the bronchioles spasm that carry air to and fro the lungs. This muscle spasm constricts the airways and blocks the flow of air.

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