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Which of the following has an effect on water potential () in plants? a. air pressure b. water-attracting matrices c. dissolved solutes d. A and C only e. A, B, and C36-2: 36-2 Slide7: 4. Which of the following statements about xylem is incorrect? a. It conducts material upward. b. It conducts materials within dead cells. c. It transports mainly sugars and amino acid d. It has a lower water potential than soil does. e. No energy input from the plant is required for xylem transport. Slide8: 5. Which of the following would likely not contribute to the surface area available for water absorption from the soil by a plant root system? a. root hairs b. endodermis c. mycorrhizae d. fungi associated with the roots e. fibrous arrangement of the roots Slide9: 6. What is the role of proton pumps in root hair cells? a. establish ATP gradients b. acquire minerals from the soil c. pressurize xylem transport d. eliminate excess electrons e. A and D only Slide10: 7. Pine seedlings grown in sterile potting soil grow much slower than seedlings grown in soil from the area where the seeds were collected. This is most likely because a. the sterilization process kills the root hairs as they emerge from the seedling. b. the normal symbiotic fungi are not present in the sterilized soil. c. sterilization removes essential nutrients from the soil. d. water and mineral uptake is faster when mycorrhizae are present. e. both B and D 36-3: 36-3 Slide12: 8. What is the main force by which most of the water within xylem vessels moves toward the top of a tree? a. active transport of ions into the stele b. atmospheric pressure on roots c. evaporation of water through stoma d. the force of root pressure e. osmosis in the root Slide13: 9. Which of the following is responsible for the cohesion of water molecules? a. hydrogen bonds between the oxygen atoms of a water molecule and cellulose in a vessel cell b. covalent bonds between the hydrogen atoms of two adjacent water molecules c. hydrogen bonds between the oxygen atom of one water molecule and a hydrogen atom of another water molecule d. covalent bonds between the oxygen atom of one water molecule and a hydrogen atom of another water molecule e. Cohesion has nothing to do with the bonding but is the result of the tight packing of the water molecules in the xylem column. Slide14: 10. Transpiration in plants requires all of the following except a. adhesion of water molecules to cellulose. b. cohesion between water molecules. c. evaporation of water molecules. d. active transport through xylem cells. e. transport through tracheids. Slide15: 11. Which of the following statements about transport in plants is false? a. Weak bonding between water molecules and the walls of xylem vessels or tracheids helps support the columns of water in the xylem. b. Hydrogen bonding between water molecules, which results in the high cohesion of the water, is essential for the rise of water in tall trees. c. Although some angiosperm plants develop considerable root pressure, this is not sufficient to raise water to the tops of tall trees. d. Most plant physiologists now agree that the pull from the top of the plant resulting from transpiration is sufficient, when combined with the cohesion of water, to explain the rise of water in the xylem in even the tallest trees. e. Gymnosperms can sometimes develop especially high root pressure, which may account for the rise of water in tall pine trees without transpiration pull. Slide16: 12. Active transport would be least important in the normal functioning of which of the following plant tissue types? a. leaf transfer cells b. stem xylem c. root endodermis d. leaf mesophyll e. root phloemSlide17: 13. Xylem vessels, found in angiosperms, have a much greater internal diameter than tracheids, the only xylem conducting cells found in gymnosperms. The tallest living trees, redwoods, are gymnosperms. Which of the following is an advantage of tracheids over vessels for long-distance transport to great heights? a. Adhesive forces are proportionally greater in narrower cylinders than in wider cylinders. b. The smaller the diameter of the xylem, the more likely cavitation will occur. c. Cohesive forces are greater in narrow tubes than in wide tubes of the same height. d. Only A and C are correct. e. A, B, and C are correct. 36-4: 36-4 Slide19: 14. Guard cells do which of the following? a. protect the endodermis b. accumulate K+ and close the stomata c. contain chloroplasts that import K+ directly into the cells d. guard against mineral loss through the stomata e. help balance the photosynthesis-transpiration compromise Slide20: 15. All of the following normally enter the plant through the roots except a. carbon dioxide. b. nitrogen. c. potassium. d. water. e. calcium.Slide21: 16. Photosynthesis begins to decline when leaves wilt because a. flaccid cells are incapable of photosynthesis. b. CO2 accumulates in the leaves and inhibits photosynthesis. c. there is insufficient water for photolysis during light reactions. d. stomata close, preventing CO2 entry into the leaf. e. the chlorophyll of flaccid cells cannot absorb light.Slide22: 17. The water lost during transpiration is an unfortunate side effect of the plant's exchange of gases. However, the plant derives some benefit from this water loss in the form of a. evaporative cooling. b. mineral transport. c. increased turgor. d. A and B only e. A, B, and CSlide23: 18. The opening of stomata is thought to involve a. an increase in the osmotic concentration of the guard cells. b. a decrease in the osmotic concentration of the stoma. c. active transport of water out of the guard cells. d. decreased turgor pressure in guard cells. e. movement of K+ from guard cells.Slide24: 19. Guard cells are the only cells in the epidermis that contain chloroplasts and can undergo photosynthesis. This is important because a. chloroplasts sense when light is available so that guard cells will open. b. photosynthesis provides the energy necessary for contractile proteins to flex and open the guard cells. c. guard cells will produce the O2 necessary to power active transport. d. ATP is required to power proton pumps in the guard cell membranes. e. both A and C Slide25: 20. All of the following are adaptations that help reduce water loss from a plant except a. transpiration. b. sunken stomata. c. C4 photosynthesis. d. small, thick leaves. e. crassulacean acid metabolism.36-5: 36-5 Slide27: 21. Phloem transport is described as being from source to sink. Which of the following would most accurately complete this statement about phloem transport as applied to most plants in the late spring? Phloem transports ____ from the ____ source to the ____ sink. a. amino acids; root; mycorrhizae b. sugars; leaf; apical meristem c. nucleic acids; flower; root d. proteins; root; leaf e. sugars; stem; root Slide28: 22. Arrange the following five events in an order that explains the mass flow of materials in the phloem. 1. Water diffuses into the sieve tubes. 2. Leaf cells produce sugar by photosynthesis. 3. Solutes are actively transported into sieve tubes. 4. Sugar is transported from cell to cell in the leaf 5. Sugar moves down the stem. a. 2, 1, 4, 3, 5 c. 2, 4, 3, 1, 5 e.2, 4, 1, 3, 5 b. 1, 2, 3, 4, 5 d. 4, 2, 1, 3, 5 Slide29: 23. According to the pressure flow hypothesis of phloem transport, a. solute moves from a high concentration in the "source" to a lower concentration in the "sink." b. water is actively transported into the "source" region of the phloem to create the turgor pressure needed. c. the combination of a high turgor pressure in the "source" and transpiration water loss from the "sink" moves solutes through phloem conduits. d. the formation of starch from sugar in the "sink" increases the osmotic concentration. e. the pressure in the phloem of a root is normally greater than the pressure in the phloem of a leaf. Slide30: 24. Plants do not have a circulatory system like that of some animals. If a given water molecule did "circulate" (that is, go from one point in a plant to another and back), it would require the activity of a. only the xylem. b. only the phloem. c. only the endodermis. d. both the xylem and the endodermis. e. both the xylem and the phloem. You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.