Category 5 Question Preview (ID: 38047)
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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?
a) allows more sunlight to be available to algae
b) inhibits the spread of pathogens in algae colonies
c) reduces the number of organisms that feed on algae
d) increases the competition between different algae species
Which of the following statements regarding the nitrogen cycle is correct?
a) Nitrogen is never a component of organic molecules
b) Decomposers provide protein to the atmosphere
c) ammonia and carbohydrates are formed from nitrogen during lightning storms
d) nitrogen-fixing bacteria in the soil convert atmospheric nitrogen into a usable form for other organisms
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?
a) organism, community, population, ecosystem
b) organism, population, community, ecosystem
c) population, organism, community, ecosystem
d) population, organism, ecosystem, community
Which of the following is most likely to cause the greatest disruption to an ecosystem?
a) emptying an aquarium containing non-native species into a local waterway
b) cutting down a small cedar tree to make holiday decorations
c) cleaning the windshield of a car with an alcohol-based glass cleaner
d) mowing the lawn in a city park
Which organisms directly help to reduce overpopulation in a deer herd
a) parasites and predators
b) parasites and scavengers
c) decomposers and predators
d) decomposers and comsumers
Eliminating microorganisms from an ecosystem would have all of the following effects EXCEPT
a) increased carbon dioxide available to plants
b) plants would be starved of key nitrogen-containing nutrients
c) food chains would be disrupted
d) decomposition would halt
As ecosystems move through the stages of succession, the populations of orgainsms in them change. Which of the following describes the stage of succession likely to have the most species diversity?
a) a newly formed volcanic island
b) an agricultural field that has not been plowed for one year
c) a temperate forest that has never been cleared by logging
d) a field that is regularly mowed
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?
a) yogurt
b) fertilizer
c) plastics
d) antibiotics
How do an increase in the organic matter in soil and an increase in soil depth affect the population of plants in an area
a) larger plants become the dominant organisms
b) mosses replace flowering plants
c) nitrogen fixing bacteria kill young trees
d) grasses become diseased
What is lost to the environment at each trophic level?
a) water
b) heat
c) carbon dioxide
d) oxygen
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