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The gaseous product of a process in plants is a requirement for another vital process that releases energy. Given below are four combinations of the process and product. Identify the correct answer.
1. Respiration and Nitric oxide
2. Transpiration and Water vapour
3. Photosynthesis and Oxygen
4. Germination and carbon dioxide

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Correct Answer - Option 3 : Photosynthesis and Oxygen

The correct answer is Photosynthesis and Oxygen.

  • Oxygen is the gaseous product of photosynthesis which is also required for respiration.
  • Photosynthesis, the process by which green plants and certain other organisms transform light energy into chemical energy.
  • During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.

​                        6CO2  + 6H2\(\longrightarrow \) C6H12O6  + 6O2

  • Oxygen is essential for another vital process in organisms that releases energy, i.e., respiration. 
  • The breaking of the C-C bonds of complex compounds through oxidation within the cells, leading to the release of a considerable amount of energy is called respiration.
  • The compounds that are oxidized during this process are known as respiratory substrates. 

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