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Science · 2026 · 2 marks
CBSE 2026 · Region 5 · Set 3 · Q11
Why the lungs always contain a residual volume of air ?
Marking-scheme solution
The lungs always contain a residual volume of air so that there is sufficient time for oxygen to be absorbed and for the carbon dioxide to be released.
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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.