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  Section: Introduction to Botany » Physical Properties of Protoplasm
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Composition of Protoplasm

Physical Properties of Protoplasm
  Composition of Protoplasm

Water is often the most abundant substance of protoplasm. Water can account for more than 90 percent of protoplasm weight, although in seeds, the figure can be as low as 10 percent. Proteins can account for from 7 to 10 percent; fats 1 to 2 percent: vitamins and enzymes approximately 1 percent: and minerals approximately 1 percent. Another way this might be expressed is to say that for each molecule of protein in protoplasm, there may be 18,000 molecules of water, 10 molecules of fat, and 100 molecules of inorganic materials.


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