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The branch of biology dealing with interactions among organisms and betweenorganisms and their environment iscalled. economy. modeling. recycling. ecology. The combined portions of Earth in which all living things exist is called the. biome. community. ecosystem. biosphere.
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Which ecological inquiry method is an ecologist using when he or she enters an area periodically to count the population numbers of a certain species?
What is an ecological model of the relationships that form a network of complex interactions among organisms in a community from producers to decomposers?
Only 10 percent of the energy stored in an organism can be passed on to the next trophic level. Of the remaining energy, some is used for the organism’s life processes, and the rest is
An ecologist who is studying the relationships among the dominant communities in a geographical region is studying an ecosystem. _________________________
The passage of energy from one organism to another according to a particular feeding sequence is called a food chain. _________________________
The biosphere actively cycles less than 1 percent of all the carbon on Earth, even though carbonis the key ingredient in all living systems. _________________________
Aquatic ecosystems can receive a large input of a limiting nutrient from the runoff from heavily fertilized fields. _________________________
A lake that is protected from receiving the runoff from a cultivated field is likely to remain a healthy ecosystem. _________________________
The use of radio tags, satellites, and microscopes are all techniques employed in the basicecological research method of ____________________.
Of the organisms represented in Figure 3–1, the organisms in the oceans with the smallest total biomass are most likely the ____________________.
In a four-level energy pyramid, if the first level contains 500 calories of energy, the third level will contain approximately ____________________ calories.
Phosphorus is a key ingredient of ____________________ because farmers know that it forms part of the energy-producing molecules that plants require in order to grow.
Consider a food web in which snakes eat mice; toads eat beetles; owls eat mice and toads; eagles eat rabbits, snakes, and owls; cougars eat deer; and foxes eat rabbits and mice. What animal occupies (gets energy in) more than one trophic level? Explain
What is the most likely explanation for why Figure 3–2 shows only one organism at its base? In what way would an energy diagram be different?
Would you receive more energy from corn by eating it directly or by eating the same mass of beef from a cow that had been fed on corn? Explain your reasoning
A farmer harvests a crop of corn from a large field. He then plants beans, which are legumes, in that same field. Once the beans are growing well, the farmer plows them back into the soil to decay. What would be the advantage of plowing the bean plants back into the soil?