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In the early 1600s, a scientist planted a willow tree that weighed 5 pounds in 200 pounds of dry soil. He placed it outside and watered it for 5 years. At the end of that time, he observed that the tree had gained 164 pounds 3 ounces, while the soil had lost just 2 ounces. From this, he concluded that plants gain weight from the water they take in.

His conclusion was based on:

Answer :

Final answer:

The scientist's experiment concluded that plants gain weight from the water they take in, forming biomass via photosynthesis. This conclusion was drawn from observing a willow tree's significant weight gain over 5 years with little loss in soil weight.

Explanation:

The scientist in the study you mentioned observed a willow tree that gained 164 pounds 3 ounces in weight over 5 years, while the surrounding dry soil lost only 2 ounces. His experiments led him to identify that the tree's significant weight gain was not from the soil but from the water it absorbed. This formed the basis of his conclusion.

This experiment effectively demonstrated the role of water in a plant's biomass increase. Through photosynthesis, plants use water and carbon dioxide to create glucose, which contributes to their growth and weight gain. So the scientist's conclusion was indeed correct—plants do gain weight from the water they take in.

Learn more about Plant Biomass here:

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