Which of the following statements regarding food webs is true?
A) A consumer may eat only one type of producer.
B) Detritivores consume dead organic matter from a specific trophic level.
C) Several species of primary consumers may feed on the same species of producer.
D) Nutrient transfer moves from producer to consumer and back.
E) A hawk at the top of the food web is only a quaternary producer.
Answer: C) Several species of primary consumers may feed on the same species of producer.
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What makes a nutrient an essential nutrient to plants?
A. It is required for photosynthesis or respiration. B. It is required for normal growth and reproduction. C. It is part of photosynthetic structures. D. It is needed in large quantities by all plants.
All of the following are characteristics of viruses except
A. they can cause mild diseases. B. they can cause fatal diseases. C. they can be crystallized. D. they often have a geometric capsid. E. they have a viscous fluid inside their capsids.
Based in the information provided, the best explanation for the low numbers of spiders and flies in plot 5 is:
A. centipedes are actively consuming flies and spiders. B. there were not enough spiders to catch and consume all the flies. C. there were not enough flies to support a large centipede population. D. centipedes prefer spiders to flies.
Certain properties of water—its cohesion, surface tension, and resistance to temperature change—are all:
A. a function of the partial negative charge on the H atoms of a water molecule. B. a function of the hydrogen bonds within a water molecule. C. a function of the hydrogen bonds between water molecules. D. a function of the non-polar covalent bonds between the H and O atoms within a water molecule.