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Science · 2025 · 3 marks
CBSE 2025 · Region 4 · Set 3 · Q29
What is the first step of cellular respiration? In which part of the cell does it occur? Write the equation for the process of breakdown of glucose…
What is the first step of cellular respiration? In which part of the cell does it occur ? Write the equation for the process of breakdown of glucose in a human cell :
(i)
in the presence of oxygen
(ii)
due to lack of oxygen
Marking-scheme solution
The breakdown of glucose to form pyruvate or pyruvic acid.
Occurs in cytoplasm of the cell.
(i)
In the presence of oxygen:
(ii)
Due to lack of oxygen
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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.