The correct sequence of air passage during inhalation is (d) Nostrils → pharynx → larynx → trachea → alveoli.
Explanation:
Nostrils: Air enters the body through the nostrils.
Pharynx: The air then travels to the pharynx, which is the back of the throat.
Larynx: Also known as the voice box, the larynx is next in the sequence.
Trachea: The trachea, or windpipe, carries the air down to the lungs.
Alveoli: The air finally reaches the alveoli, small air sacs in the lungs where gas exchange occurs.
Why the other options are incorrect:
(a) Nostrils → larynx → pharynx → trachea → lungs: This option is incorrect because the pharynx should come before the larynx.
(b) Nasal passage → trachea → pharynx → larynx → alveoli: This option is incorrect as the air first enters the nasal cavity, then the pharynx, and finally the larynx.
(c) larynx → nostrils → pharynx → lungs: This option is incorrect as the air does not first enter the larynx.