Figure 28.12
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The following question refers to the accompanying figure illustrating transport in phloem.
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Letter ____ can indicate a fruit or developing root cells.
A. A
B. B
C. C
D. D
E. E
Answer: E
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A potassium ion gradient is set up in insect Malpighian tubules through an active transport process. As a result, potassium concentration is higher in the lumen of the tubules than in hemolymph. How would the potassium gradient affect water movement?
A) Water would be forced out of the lumen of the Malpighian tubules through an osmotic gradient. B) The potassium gradient would have no effect on water movement. C) There would be a net movement of water into the lumen of the tubules. D) Water would be conserved, forming a hypertonic solution in the Malpighian tubules.
The macroalgae are commonly known as:
a. seagrasses. b. seaweeds. c. kelps. d. higher plants. e. phytoplankton.
Stress hormones have been shown to interact with drugs of abuse in that
a. stressors enhance the responses of rodents to psychostimulants like amphetamine. b. humans may relapse to drug use behaviors when under stress. c. they may alter the responsiveness of brain dopamine systems. d. All of the above
A species that plays a critical role in maintaining the structure of an ecological community and helps to determine the types and numbers of various other species in the community is known as
A. a predator. B. the alpha species. C. the dominant species. D. a keystone species. E. the primary species.