Excretory products of autotrophic plants:
Correct answer: B. O2
- A. CO2
- B. O2
- C. H2O
- D. All of these
Explanation
During photosynthesis, plants use carbon dioxide and water to produce glucose and oxygen. The oxygen is released as an excretory product because it is not needed by the plant for photosynthesis. Therefore, the correct answer is oxygen (O ). Carbon dioxide (CO ) and water (H O) are essential reactants in this process and thus are not excretory products.
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Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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