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Period: Jan 1, 1580 to
Jan Baptist - water into wood and leaves
Jan Baptist van Helmont (1580-1644) grew a willow tree in a tub after carefully weighing the plant and the soil. He watered the plant regularly, and after 5 years reweighed the plant and the soil. The mass of the plant had increased by 74.5 kilograms, but the mass of soil had not changed. He concluded that the plant converted water into wood and leaves. -
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Jan Ingenhousz - light is necessary
Jan Ingenhousz (1730-1799) showed that light was necessary for this production -
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Joseph Priestley - plants produce oxygen
Joseph Priestley (1733-1804) demonstrated that plants produce oxygen -
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Jean Senebier - plants absorb carbon dioxide
Jean Senebier (1742-1809) found in 1782 that plants absorb carbon dioxide from the air -
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Nicolas de Saussure - water was chemically involved in plant growth
Nicolas de Saussure (1767-1845) showed in 1804 that water was chemically involved in plant growth. Although the basics of plant growth have been known for about 200 years, scientists still do not fully understand the process of photosynthesis. There is still much that confuses them. They have not yet, for example, been able to duplicate photosynthesis outside a living cell