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Science · 2026 · 3 marks
CBSE 2026 · Region 2 · Set 2 · Q13
Observe the following diagrams: Case P Case Q Case R (a) What change will be observed in Cases 'P', 'Q' and 'R'? Give reasons. (b) In which case: (i)…
Observe the following diagrams :
Case P Case Q Case R
(a)
What change will be observed in Cases 'P', 'Q' and 'R' ? Give reasons.
(b)
In which case :
(i)
is aerobic respiration taking place ?
(ii)
is fermentation taking place ?
Marking-scheme solution
Case P- Change occurs extremely slow / No change.
Case Q- Limewater will turn milky because exhaled air contains high concentration of carbon dioxide.
Case R- Fermentation occurs in sugar solution / limewater may turn milky.
(b) (i) Case Q
(ii) Case R
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CBSE Class 10 Science past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.