Base your answer to the question on the information and diagram below and on your knowledge of biology. 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.
Willow
Willow
Dry soil
Dry soil
5 years
Water only
200 lbs
199 lbs 14 OZ
5 lbs
169 lbs 3 Oz
From this, he concluded that plants gain weight from the water they take in. His conclusion was based on
1.
the input of scientists from many countries doing similar studies
2.
the application of advanced technologies to the study of a problem
3
careful observation, measurements, and inferences from his data
an extensive knowledge of the process of photosynthesis
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