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Give Suitable Explanations for the Following : - Biology

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Question

Give suitable explanations for the following :

One should breathe by nose and never by mouth. 

Short Note

Solution

One should breathe by nose and never by mouth because nose contains hair and mucous to trap dust and micro-organisms, so that the inhaled air becomes pure and the respiratory passage is free of dust and micro-organisms. 

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Types of Hygiene: Personal Hygiene
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Chapter 15: Hygiene - [A Key to Healthy Life] - Long answer type [Page 155]

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Selina Concise Biology [English] Class 9 ICSE
Chapter 15 Hygiene - [A Key to Healthy Life]
Long answer type | Q 1.1 | Page 155
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