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Science · 2023 · 3 marks
CBSE 2023 · Region 1 · Set 1 · Q29
(a) (i) State the role of ATP in cellular respiration. (ii) What ensures sufficient exchange of gases in plants? (iii) State the conditions on which…
(a)(i)
State the role of ATP in cellular respiration.
(ii)
What ensures sufficient exchange of gases in plants ?
(iii)
State the conditions on which the direction of diffusion of gases in plant depend upon.
OR
(b)(i)
What is the internal energy reserve in plants and animals ?
(ii)
How desert plants perform photosynthesis if their stomata remain closed during the day ?
Marking-scheme solution
(a) (i) Energy currency for cellular processes / ATP breaks down to give a fixed amount of energy which can drive the endothermic reactions taking place in the cell.
(ii) Stomata and surface of leaves, stems and roots.
(iii) Environmental conditions Requirements of the plant. OR
(b) (i) Plants -Starch Animals- Glycogen
(ii) Desert plants take up carbon dioxide at night and prepare an intermediate compound which is acted upon by the energy absorbed by the chlorophyll during the day.
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CBSE Class 10 Science past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.