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Physiological Steps in Photosynthesis

  • Λεωτυχίδας
  • December 22, 2018 at 1:48 PM
  • Λεωτυχίδας
    Beginner
    • December 22, 2018 at 1:48 PM
    • #1

    There are five successive and mutually dependent steps in the process of photosynthesis, as follows:

    • There must be a gas exchange between the plant tissue and the surrounding air, by means of which the carbon dioxide of the air may reach the protoplasm of the chlorophyll-containing cells.
    • Radiant energy must be absorbed, normally that of sunlight, although photosynthesis can be brought about by the energy from certain forms of artificial light.
    • Carbon dioxide and water must be decomposed by the energy thus absorbed, and the nascent gases thus produced combined into some synthetic organic compound, with a resultant storage of potential energy.
    • This first organic synthate must be condensed into some carbohydrate suitable for translocation and storage as reserve food.
    • The oxygen, which is a by-product from the decomposition of the water and carbon dioxide and the resultant synthetic process, must be returned to the air by a gas exchange.

    Of the five steps in this process, the first two and the last are essentially purely physical phenomena, the chemical changes involved being those of the third and fourth steps. Hence, it is only these two parts of the process which need be taken into account in a consideration of the chemistry of photosynthesis.

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