WHAT ARE THE CONTRIBUTIONS OF HALES TO PHOTOSYNTHESIS ??
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He determined the direction in which sap flows in plants (it flows upward), and he measured the sap's pressure. He also measured the rates of growth of shoots and leaves and the pressure roots exert on sap, and he investigated plant respiration.
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Stephen Hales (17 September 1677 – 4 January 1761) was an English clergyman who made major contributions to a range of scientific fields including botany, pneumatic chemistry and physiology. He was the first person to measure blood pressure.
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