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B
Cytosol and stroma of chloroplast
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C
Cytosol and oxysomes of mitochondrion
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D
Matrix of mitochondrian and inner membrane of mitochondrian
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Solution
The correct option is A Cytosol and matrix of mitochondrion The first step of cellular respiration is glycolysis that operates in the cytoplasm of the cell. Glycolysis is followed by Krebs cycle which takes place in the mitochondrial matrix.
So the answer is 'Cytosol and matrix of mitochondrion'.