Read the following text about photosynthesis in plants.
Although some of the steps in photosynthesis are still not completely understood, the overall photosynthetic equation has been known since the 1800s.
Jan van Helmont began the research of the process in the mid-1600s when he carefully measured the mass of the soil used by a plant and the mass of the plant as it grew. After noticing that the soil mass changed very little, he hypothesised that the mass of the growing plant must come from the water, the only substance he added to the potted plant. His hypothesis was partially accurate—much of the gained mass also comes from carbon dioxide as well as water.
In 1796, Jean Senebier, a Swiss pastor, botanist, and naturalist, demonstrated that green plants consume carbon dioxide and release oxygen under the influence of light. Soon afterwards, Nicolas-Théodore de Saussure showed that the increase in mass of the plant as it grows could not be due only to uptake of CO2, but also to the incorporation of water.
According to the text, are the following statements true, false or not given?
- We now fully understand the process of photosynthesis.
- Van Helmont's hypothesis did not take into account that plants consume carbon dioxide.
- De Saussure demonstrated that both carbon dioxide and water contribute to an increase in mass in plants as they grow.
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