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Question : Give reason :(i)Fine hair and mucusare present in the nasal passage. (ii)Rings of cartilage are present in the throat .

Answer»

Solution :(i) Fine hairand mucus are PRESENTIN thenasal passage so that any DUST particles, pathogens etc., can be trapped in here and only clean AIR will enterthe lungs. This is one of the defencemechanism of our body.
(ii)Rings of cartilage are presentin the throat in thethroat so that the tracheadoes not collapseon RESPIRATION.


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