A biomass pyramid illustrates the ____ of all organisms at each trophic level
a. size
b. number
c. dry weight
d. total weight
e. total utilization of materials
ANSWER: c
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Which of the following is a two-carbon hydrocarbon with a single-carbon carbon bond?
a. ethene b. ethyne c. ethane d. ethylene
Which is incorrect about deep-sea organisms?
A. Some prokaryotes are photosynthetic there. B. Some prokaryotes live symbiotically within the tissues of heterotrophs that live there. C. Some prokaryotes extract energy from hydrogen sulfide. D. Some heterotrophic organisms obtain energy from debris that falls from above.
The osculum of a sponge is entirely blocked by a fungal infection. Predict what will happen.
A. Choanocytes will no longer be able to function. B. Digestion will be prevented from occurring. C. The flow of water out of the sponge will decrease. D. Water will be unable to enter the sponge.
Which of the following statements is most true concerning speciation by polyploidy?
a. Polyploidy has been an important driver of plant diversification. b. Polyploidy only leads to speciation in plants. c. Botanists believe only a few plant species have arisen through polyploidy. d. Polyploidy only leads to speciation in animals. e. Polyploidy is common but has no effect on speciation.