determine the source of raw materials for plant growth.

About 200 years ago, Jan Baptista van Helmont tried to determine the source of raw materials for plant growth. To do so, he planted a young tree weighing 5 pounds in a barrel filled with 200 pounds of soil. He watered the tree regularly. After 5 years, he again weighed the tree and the soil. At that time the tree weighed 169 pounds, 3 ounces, and the soil weighed 199 pounds, 14 ounces. Because the tree’s weight had increased so much, and the soil’s weight had remained about the same, he concluded that the tree gained weight as a result of the water he had added to the barrel. Analyze his conclusion in terms of the information you have learned from this chapter.

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Design an Experiment The unicellular alga Chlamydomonas reinhardtii has two flagella assembled from tubulin proteins.

Design an Experiment The unicellular alga Chlamydomonas reinhardtii has two flagella assembled from tubulin proteins. If a researcher changes the pH from approximately neutral (their normal growing condition) to pH….

Design an experiment to answer this question.

The digestive tract of newborn chicks is free of bacteria until, for example, they eat food that has been exposed to the feces of adult chickens. The ingested bacteria establishes….

Devise an experimental plan to guide your research, including hypotheses about one or more ways the change may affect the species’ growth and/or life cycle.

A moss species that you study occurs in lush abundance in the moist, shaded forest floor in a grove of coast redwoods (Sequoia sempervirens) in Northern California. When one of….