CBSE 2025 · Region 4 · Set 3 · Q29 · 3 marks
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
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 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.