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Science · 2025 · 3 marks
CBSE 2025 · Region 5 · Set 1 · Q29
(a) Write the name and one function of respiratory pigment found in human beings. (b) Why do lungs always contain a residual volume of air? (c) Why…
(a)
Write the name and one function of respiratory pigment found in human beings.
(b)
Why do lungs always contain a residual volume of air ?
(c)
Why is ATP known as energy currency of the living beings ?
Marking-scheme solution
(a) •Haemoglobin
-To take up oxygen from lungs and carry it to tissues which are deficient in oxygen / Transports oxygen to various body parts.
(b) To provide sufficient time for oxygen to be absorbed and for carbon dioxide to be released.
(c)
ATP provides energy for various cellular processes
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CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.