Transpiration Lab Directions.pdf - AP Biology Transpiration Lab The purpose of this investigation is to test the effects of environmental variables on

Transpiration Lab Directions.pdf - AP Biology Transpiration...

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AP Biology: Transpiration Lab The purpose of this investigation is to test the effects of environmental variables on rates of transpiration using a controlled experiment. to understand the structures used by plants to transport water & regulate water movement. Background Cells and organisms must exchange matter with the environment to grow, reproduce, and maintain organization, and the availability of resources influences responses and activities. For example, water and macronutrients are used to synthesize new molecules, and in plants, water is essential for photosynthesis. Organisms have evolved various mechanisms for accumulating sufficient quantities of water, ions, and other nutrients and for keeping them properly balanced to maintain homeostasis. In general, animals possess one or more mechanisms, such as those involved in excretion, that let them ingest solutions of nutrients and transport and/or eliminate any excess ions or water. However, plants take a different approach; they absorb and transport water, nutrients, and ions from the surrounding soil via osmosis, diffusion, and active transport. Once water and dissolved nutrients have entered the root xylem, they are transported upward to the stems and leaves as part of a process of transpiration (the evaporation of water from the plant surface). The amount of water
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