Solved by a verified expert:1. What is the site for gas exchange on the leaf?Select one:a. Guard cellb. Phloemc. Xylemd. Stomata2. What protects the leaf against desiccation and stress from other environmental factors?Select one:a. Stomatab. Mesophyllc. Epidermisd. Cuticle3. What is the main function of the stem in a plant?Select one:a. Transporting nutrients and water to the leavesb. Photosynthesisc. Absorption of water and minerals from the groundd. Avoiding desiccation of the plant4. Guard cells are located on the surface of the underside of leaves. How does this structure of the leaf enable the function of guard cells?Select one:a. Because the guard cells are at the surface, they keep the stomata constantly open and therefore can help with the exchange of gases.b. Because the guard cells are at the surface, they keep the stomata constantly closed and therefore help prevent water loss.c. Because the guard cells are at the surface, they are exposed to sunlight and therefore can perform photosynthesis.d. Because the guard cells are at the surface, they are in constant contact with the atmosphere and therefore facilitate the exchange of gases5. Which tissue types comprise the vascular bundle in gymnosperms?Select one:a. epidermis and xylemb. stomatal pore and mesophyllc. resin ducts and epidermisd. xylem and phloem6. Which of the following is characteristic of a monocot stem cross section?Select one:a. vascular bundles that are spread evenly among the parenchymab. vascular bundles that fill the entire cross section, leaving no room for parenchymac. vascular bundles that are only at the periphery of the cross sectiond. vascular bundles that contain phloem only and no xylem7. How are the xylem and phloem arranged in a eudicot root?Select one:a. The xylem is at the periphery of the root, whereas the phloem is at the center of the root.b. Eudicots do not have xylem and phloem in the roots.c. The xylem is at the center of the root, surrounded by several phloems.d. The xylem and phloem are arranged in rings at the periphery of the root.8. Which of the following is a major difference between monocot and eudicot roots?Select one:a. In monocots, the xylem and phloem are at the periphery, whereas in eudicots, the xylem and phloem are located near the center of the root.b. Eudicot roots lack xylem and phloem, whereas monocot roots have both xylem and phloem.c. In eudicots, the xylem and phloem are at the periphery, whereas in monocots, the xylem and phloem are located near the center of the root.d. Monocot roots lack xylem and phloem, whereas eudicot roots have them arranged at the periphery of the root.
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