The site of exchange of materials between the blood and the body tissues is the ______.
a) arterioles
b) veins
c) arteries
d) capillaries
e) venules
Ans: d) capillaries
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Which of the following arise, directly or indirectly, from meristematic activity?
A) secondary xylem B) leaves C) dermal tissue D) tubers E) secondary xylem, leaves, dermal tissue, and tubers
You observe variation in the auditory signal that males use to attract females. Which of the following would be true if the signal is an accurate indicator of male quality?
a. The highest-quality males have the most common form of the signal. b. The highest-quality males have the most extreme form of the signal. c. Male quality is unrelated to signal variation. d. Only the highest-quality females prefer the highest-quality males. e. Females will use multiple signals to identify the highest-quality males.
Vegetative propagation means that
a. part of a leaf, a stem, or a root, when torn away from the parent plant and planted under proper conditions, can develop into a new plant. b. a plant cannot reproduce by forming flowers, fruits, and seeds. c. the leafy part of the gametophyte can grow into a new plant if planted. d. flowers and fruits from one plant can be grafted onto another closely related plant to produce hybrids. e. all of these descriptions fit
Which of the following is an example of an aquatic ecosystem?
A. fishes, snails, crabs, water, and salinity B. fishes, snails, and crabs only C. both water and salinity D. water only E. salinity only