Sentence Examples


  • Photos ynthesis.In the presence of light and when the plant is subjected to a suitable temperature, photosynthesis commences, provided that the plant has access to air containing its normal amount of carbon dioxide, about 3 parts, or rather less, in 10,000.
  • The first visible carbohydrate formed, one which appears so rapidly on the commencement of photosynthesis as to have been regarded as the first evidence of the setting up of the process, is starch.
  • Only the " free " carbonic acid and that of the bicarbonate can be utilized in the process of photosynthesis by the diatoms and alga.
  • The carbonic acid is taken from solution and then bicarbonate (usually that of magnesium) dissociates into carbonic acid and normal carbonate, and the process of photosynthesis ceases when there is no more bicarbonate in solution.
  • Pure water, then, has a hydrogen-ion concentration of io 7 but sea-water gives (because of the mixture of the salts in solution) the concentration 108 ' 2 and when photosynthesis by the larger alga, or diatoms, is very active this figure falls to about 109 ' 1.

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