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How do an increase in the organic matter in soil and an increase in soil depth affect the population of plants in an area
heat
emptying an aquarium containing non-native species into a local waterway
increased carbon dioxide available to plants
reduces the number of organisms that feed on algae
larger plants become the dominant organisms
nitrogen-fixing bacteria in the soil convert atmospheric nitrogen into a usable form for other organisms
organism, population, community, ecosystem
antibiotics
Eliminating microorganisms from an ecosystem would have all of the following effects EXCEPT
heat
emptying an aquarium containing non-native species into a local waterway
increased carbon dioxide available to plants
reduces the number of organisms that feed on algae
larger plants become the dominant organisms
nitrogen-fixing bacteria in the soil convert atmospheric nitrogen into a usable form for other organisms
organism, population, community, ecosystem
antibiotics
A science class is planning a field trip to a local farm that has a large pond. Which of the following lists the order of biological organization from smallest to largest that the students can expect to find in the pond?
heat
emptying an aquarium containing non-native species into a local waterway
increased carbon dioxide available to plants
reduces the number of organisms that feed on algae
larger plants become the dominant organisms
nitrogen-fixing bacteria in the soil convert atmospheric nitrogen into a usable form for other organisms
organism, population, community, ecosystem
antibiotics
Which of the following is most likely to cause the greatest disruption to an ecosystem?
heat
emptying an aquarium containing non-native species into a local waterway
increased carbon dioxide available to plants
reduces the number of organisms that feed on algae
larger plants become the dominant organisms
nitrogen-fixing bacteria in the soil convert atmospheric nitrogen into a usable form for other organisms
organism, population, community, ecosystem
antibiotics
Some fungi secrete substances that are toxic to bacteria that compete with them for food. Scientists have used their knowledge of this ability of fungi in order to produce which of the following substances?
heat
emptying an aquarium containing non-native species into a local waterway
increased carbon dioxide available to plants
reduces the number of organisms that feed on algae
larger plants become the dominant organisms
nitrogen-fixing bacteria in the soil convert atmospheric nitrogen into a usable form for other organisms
organism, population, community, ecosystem
antibiotics
The overgrowth of algae poses a major problem for coral reefs. Intensive fishing is one factor that contributes to algae overgrowth because it does which of the following?
heat
emptying an aquarium containing non-native species into a local waterway
increased carbon dioxide available to plants
reduces the number of organisms that feed on algae
larger plants become the dominant organisms
nitrogen-fixing bacteria in the soil convert atmospheric nitrogen into a usable form for other organisms
organism, population, community, ecosystem
antibiotics
What is lost to the environment at each trophic level?
heat
emptying an aquarium containing non-native species into a local waterway
increased carbon dioxide available to plants
reduces the number of organisms that feed on algae
larger plants become the dominant organisms
nitrogen-fixing bacteria in the soil convert atmospheric nitrogen into a usable form for other organisms
organism, population, community, ecosystem
antibiotics
Which of the following statements regarding the nitrogen cycle is correct?
heat
emptying an aquarium containing non-native species into a local waterway
increased carbon dioxide available to plants
reduces the number of organisms that feed on algae
larger plants become the dominant organisms
nitrogen-fixing bacteria in the soil convert atmospheric nitrogen into a usable form for other organisms
organism, population, community, ecosystem
antibiotics
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