Question

Explain the observations and conclusions of the experiments conducted by Van Helont and Jan
Ingenhousz on photosynthesis.

Answer 1

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Van Helmont came to the conclusion that plants must take most of their weight from water. He did not know about gases. Joseph Priestley ran a series of experiments in 1772 (Figure 3.1. Jan Ingenhousz and Jean Senebier found that the air is only reviving in the day time and that CO2 is assembled by plants.

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