Which tissue gives rise to secondary xylem and phloem?
a. protoderm
b. apical meristem
c. ground meristem
d. vascular cambium
e. procambium
ANSWER: d
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When an apical meristem cell divides, one daughter cell is called the initial and the other is called the derivative. What are the fates of these cells?
a. The initial is used to form primary meristems, and the derivative remains part of the apical meristem. b. Both the initial and the derivative remain part of the apical meristem. c. The initial remains part of the apical meristem, and the derivative is used to form primary meristems. d. Both the initial and the derivative are used to form primary meristems. e. The initial is used to form primary meristems, and the derivative is used to form secondary meristems.
In ____ immunity, the response is immediate, the antigen is detected by a fixed set of receptors, and the response does
not persist.
a. innate b. adaptive c. antibody-mediated d. cell-mediated e. autoimmunity
The element that is crucial to actual muscle contraction is
a. sodium. b. potassium. c. iron. d. magnesium. e. calcium.
An organism's role within the structure and function of a particular community is its:a
habitat. b. trophic level. c. population. d. ecological niche. e. competition.