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Science · 2026 · 3 marks
CBSE 2026 · Region 2 · Set 3 · Q13
(a)Draw a neat diagram of the human respiratory system and label its lungs, trachea, bronchi and alveoli.(b)State the roles of the following in the process of respiration :(i)Alveoli(ii)Respiratory pigments
(a)
Draw a neat diagram of the human respiratory system and label its lungs, trachea, bronchi and alveoli.
(b)
State the roles of the following in the process of respiration :
(i)
Alveoli
(ii)
Respiratory pigments
Marking-scheme solution
(a) 
(b) (i) Alveoli - Exchange of gases
(ii) Respiratory pigment - Helps in the transportation of oxygen
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CBSE Class 10 Science past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.