Some viruses have a membranelike structure on their surface, composed of lipids, proteins, and carbohydrates. This is called a(n) __________.
A. envelope
B. capsid
C. capsule
D. core
Ans: A. envelope
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One of the advantages seeds have over spores is that they can delay germination until conditions are favorable for growth
A. true B. false
The nitrogen-limitation hypothesis states that organisms select food in terms of the nitrogen content of the tissue. Why might this be true?
A. Because many consumers need large amounts of nitrogen; for example, animal tissue contains about 10 times as much nitrogen as plant tissue. B. Because most organisms are able to "fix" nitrogen more efficiently than plants. C. Because foods with lower nitrogen content are easier for consumers to digest, leading most organisms to seek out low nitrogen foods. D. Because high nitrogen levels are a key part of plant chemical defenses, resulting in organisms avoiding high nitrogen plants. E. Because plant tissues contain, on average, 10 times the level of nitrogen needed by most consumers.
Pea plants are self-pollinators. What can you further deduce about peas? (Check all that apply.)
_____ Peas will be more resistant to garden pests than other plants. _____ Peas are less likely to invade highly variable natural environments than other plants. _____ A gardener planning to collect heirloom seeds can plant different varieties of peas near each other. _____ Peas will be more resistant to new plant diseases. _____ To perform his pea cross-pollination experiments, Gregor Mendel must have first removed the stamens from flowers to prevent self-pollination. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about pollination? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Figure 46.2
The following question refers to the accompanying figure illustrating a tallgrass prairie food chain.
The letter B indicates a(n) ____.
A. producer B. herbivore C. detritivore D. carnivore E. decomposer