Multiple choice

What will happen if a child breathes with mouth and not with nose?

  1. He will breathe in more oxygen.

  2. Harmful dust particles will also enter.

  3. Saliva will not let harmful particles enter.

  4. Teeth will not let enough oxygen enter.

  5. None of these

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Yes, harmful dust particles may enter his body. Fine hair and mucus are present inside the nose to prevent dust particles from getting into the respiratory system.