Question

7. In the given diagram, 'X' and 'Y' depict events in respiration. Where do these events occur in the cell? Glucose X Pyruvate + Energy In presence of oxygen Y 6CO2 + H2O + Energy (a) X - Cytoplasm, Y - Cytoplasm (b) X - Cytoplasm, Y - Mitochondria O (C) X - Mitochondria, Y - Cytoplasm (d) X - Mitochondria, Y - Mitochondria​

Answer 1

(b) X- Cytoplasm, Y- Mitochondria.

The reaction of Glucose forming Pyruvate is termed Glycolysis. The Glycolysis reaction occurs in the cytoplasm of the cell by a series of reactions converting Glucose into Pyruvate.

The reaction of Pyruvate to yield energy, CO2, and H2O is called the citric acid cycle or the TCA cycle, or the Tricarboxylic Acid Cycle, and this reaction occurs in the Mitochondria part of the cell. For the same reason, Mitochondria is called the POWERHOUSE of the cell.

Hence, Glucose to Pyruvate occurs in the Cytoplasm whereas Pyruvate to CO2 and H20 occurs in Mitochondria.