Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 34.2, Problem 1R
Summary Introduction
To review:
The experiment that ruled out the role of pressure in the upward movement of water through the xylem.
Introduction:
Plants have specialized transport tissue for the absorption of water, minerals, and ions from the soil. These are called the xylem that functions to conduct water and minerals from roots to the shoots and leaves. Xylem consists of tracheid and vessels, which are arranged one on the other to form long tubes.
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Both cohesion-tension and root pressure are mechanisms for moving water in the xylem. What does it mean when it says that cohesion-tension pulls water, but root pressure pushes water?
why is pressure higher in parts of the phloem Where sugar is being loaded than in parts were sugars been removed?
To transport water from the root into the shoot does the water potential in the xylem need to become more positive or negative? Why?
Chapter 34 Solutions
Life: The Science of Biology
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- Can you answer this question with both parts a. How does plant growth respond to gravity in stems vs. roots? b. How is gravitropism controlled during root growth?arrow_forwardThe Casparian strip allows the root to control what solutes enter the xylem. How does it do that?arrow_forwardDescribe and explain the results shown in Table 1 and suggest how the results might have differed if lengths of root had been used.arrow_forward
- What is the adaptive advantage or evolutionary advantage being conferred on a plant whose stems are positively phototropic and whose roots are positively gravitropic?arrow_forwardBecause secondary phloem is formed from the vascular cambium just as secondary xylem is, it too has an __________________________ system and a _____________________ system. Why do the size, shape, and number of phloem rays match those of xylem rays?arrow_forwardGiven that (a) xylem is located toward the upper epidermis in leaf veins and phloem is located toward the lower epidermis and (b) the vascular tissue of a leaf is continuous with that of the stem, suggest one possible arrangement of vascular tissues in the stem that might account for the arrangement of vascular tissue in the leaf.arrow_forward
- What plant process involved in your experiment aside from transpiration?arrow_forwardIn a cross-section of a tree, where are the oldest growth rings—in the outer region or nearer the pith? Where is the oldest secondary phloem—near the outside of the tree or near the cambium?arrow_forwardDoes a shoot need to include a stem? Could a plant perform photosynthesis successfully with its leaves spread over the soil surface?arrow_forward
- Why is the secondary xylem and phloem always to either side of the vascular cambium?arrow_forwardWhen the experiment was run for 1 hour rather than 15 minutes,the results were about the same except that the stomatal openingsof plants 9–11 were comparable to those of plants 6–8. Suggest areason why.arrow_forwardWhat is the conclusion of the Experiment on Absoprtion of Water by Roots? A. Cup 1 - with half water and the lid is tightly close to ensure the evaporation of water. B. Cup 2 - with half water and few drops of oil while the plant sample's roots are immersed. C. Cup 3 - with half water and drops of ink while another plant sample's roots are immersed. D. Cup 4 - with plant sample but the roots do not reach the water.arrow_forward
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