Chapter 24 - Chapter 24 The Root Structure and Development...

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Chapter 24: The Root: Structure and Development Multiple-Choice Questions 1. Introduction; p. 528; easy; ans; b When a seed germinates, the __________ is the first structure to emerge. a. plumule b. root c. hypocotyl d. epicotyl e. cotyledon 2. Introduction; p. 528; easy; ans: d The two primary functions of roots are: a. conduction and protection. b. storage and conduction. c. anchorage and storage. d. anchorage and absorption. e. anchorage and conduction. 3. Root Systems; p. 529; moderate; ans: d In gymnosperms, magnoliids, and eudicots, the primary root is called the: a. fibrous root. b. prop root. c. lateral root. d. taproot. e. branch root. 4. Root Systems; p. 529; moderate; ans: b Which of the following statements about monocot roots is FALSE? a. The root system is generally shallower than in eudicots. b. The main root system has one prominent root. c. The roots form a fibrous root system. d. The main root system develops from roots arising from the stem. e. The primary root is short-lived. 5. Origin and Growth of Primary Tissues; p. 530; moderate; ans: c Which of the following statements about the rootcap is FALSE? a. It is covered by mucigel. b. Its cells are sloughed as it grows through the soil. c. Its sloughed cells are not replaced. d. It helps the root penetrate the soil. e. It protects the root apical meristem.
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2 Chapter 24 The Root: Structure and Development 6. Origin and Growth of Primary Tissues; p. 531; moderate; ans: b The promeristem of the root: a. is composed of initials but not derivatives. b. is the most distal part of the apical meristem. c. is the most determined part of the apical meristem. d. is characterized by few-sided cells with nondense cytoplasm. e. is composed of relatively large cells with small nuclei. 7. Origin and Growth of Primary Tissues; pp. 531–532; difficult; ans: d In a “closed type” of root apical organization, the: a. apical meristem lacks derivatives. b. cortex and vascular cylinder each have their own initials, but the rootcap and epidermis do not. c. cortex and rootcap each have their own initials, but the vascular cylinder and epidermis do not. d. rootcap, vascular cylinder, and cortex each have their own initials. e. rootcap, vascular cylinder, and cortex have common initials. 8. Origin and Growth of Primary Tissues; p. 532; difficult; ans: a Which of the following statements about the quiescent center is FALSE? a. It is located a short distance behind the apical meristem. b. It may play an important role in the organization and development of the root. c. It is a region that was mitotically active early in root development. d. It is a relatively inactive region of the mature root apical meristem. e. Quiescent centers isolated from maize can form whole roots in culture without first forming callus. 9. Origin and Growth of Primary Tissues; p. 533; moderate; ans: c Root hairs are produced in the: a. region of cell division.
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