Question

7. Explain the process of breakdown of glucose in a cell
in the presence of oxygen,
b. in the absence of oxygen. [HOTS, Foreign 2010)​

Answer 1

Answer:

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Explanation:

(i) In the presence of oxygen- When breakdown of glucose is carried out in the presence of oxygen in a cell, it is called as aerobic respiration. Glucose is converted into a 3 carbon molecule called pyruvate which further breaks down in the presence of oxygen to form carbon dioxide and water. Energy is released in this process.

(ii)In the presence of oxygen- When breakdown of glucose is carried out in the Absence of oxygen in a cell, it is called as anaerobic respiration.Glucose is converted into a 3 carbon molecule called pyruvate which further breaks down in the absence of oxygen to give lactic acid and ethyl alcohol. This process is called fermentation.

Answer 2

Answer:

breakdown of glucose in a cell in presence of glucose is aerobic respiration

breakdown of glucose in a cell in absence of glucose is anaerobic respiration

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