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Science · 2023 · 2 marks
CBSE 2023 · Region 4 · Set 1 · Q24
Two green plants are kept separately in oxygen free containers, one in the dark and other in sunlight. It was observed that plant kept in dark could…
Two green plants are kept separately in oxygen free containers, one in the dark and other in sunlight. It was observed that plant kept in dark could not survive longer. Give reason for this observation.
Marking-scheme solution
The plant kept in dark is unable to carry out photosynthesis and due to absence of oxygen it cannot respire.
But the plant kept in light is able to photosynthesize converting \(\displaystyle \mathrm{CO}_{2}\) into oxygen which it can use for respiration.
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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.