An arco book arco is a registered trademark of Thomson Learning, Inc., and is used herein under license by Peterson’s. About The Thomson Corporation and Peterson’s

66. Yellow, rounded
67. Green, wrinkled
68. Green, rounded
69. Wrinkled
Questions 70–72
(A) Cerebellum
(B) Olfactory bulb
(C) Medulla
(D) Hypothalamus
(E) Thalamus
70. Involved in processing odors
71. Integrates sensory information from somatic
receptors
72. Contains centers responsible for control of
blood pressure and respiration
Questions 53–57
(A) Stomata
(B) Guard cells
(C) Mesophyll
(D) Companion cells
(E) Petiole
53. Regulate the exchange of gases between the
leaf and the environment
54. Stalk of a leaf
55. Region between the upper and lower epider-
mis of a leaf
56. Openings in the epidermis that allow transpi-
ration to occur
57. Adjacent to sieve tube
Questions 58–61
(A) Ribosome
(B) Mitochondrion
(C) Centriole
(D) Nucleolus
(E) Peroxisome
58. Membrane-bound vesicle that contains the
enzyme catalase
59. Possesses its own genetic material and self-
replicates
60. Interacts with the endoplasmic reticulum dur-
ing protein synthesis
61. Composed of microtubules and functions in
cytoskeletal organization
Questions 62–65
(A) Contractile vacuole
(B) Flame-cell
(C) Nephridial system
(D) Malpighian tubules
(E) Nephron
62. Excretory system of insects
63. Excretory system of the earthworm
64. Excretory organelle present in some protozoans
65. Functional unit of the vertebrate kidney

---