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This activity contains 56 questions.

Question 1
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What percentage of Earth's land surface has been altered as the result of human activities?
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Question 2
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In the United States, _____ of all prescriptions contain substances derived from plants.
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Question 3
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Genetic diversity refers to variation in __________.
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Question 4
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At the current rate of extinction, some scientists predict that _____ of all animal and plant species will be extinct by the year 2100.
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Question 5
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Biodiversity includes genetic diversity, species diversity, and _____.
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Question 6
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One of the major contributors to extinction of species today is __________.
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Question 7
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Which of the following factors is most likely to lead to decreased biodiversity?
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Question 8
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When goats were introduced to an island off the California coast, the goats lived in the same areas and ate the same plants as the native deer. The deer population dwindled and finally disappeared. This is an example of _____.
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Question 9
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The niche of an animal is __________.
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Question 10
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Two species of cuckoo doves live in a group of islands off the coast of New Guinea. Of 33 islands, 14 have one species, 6 have the other, 13 have neither, and none has both. What might best explain this? The two species of birds could __________.
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Question 11
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If the niches of two species are very similar, which one of the following is true?
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Question 12
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What type of population interaction benefits neither population?
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Question 13
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Flounder look like the sea floor. This is an example of _____.
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Question 14
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Which of the following is an example of mimicry?
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Question 15
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A tick has what type of relationship with a dog?
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Question 16
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The bee fly resembles a honeybee, but the bee fly has no stinger. This is an example of _____.
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Question 17
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A lichen is actually composed of two organisms: a fungus and an alga. They depend on each other for survival. The most specific term that describes their relationship is _____.
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Question 18
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Certain species of acacia trees in Central and South America have hollow thorns that house stinging ants, which attack anything that touches the tree. The ants feed on nutrients produced by the acacias. This is an example of _____.
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Question 19
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Why does biological magnification occur?
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Question 20
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The main detritivores in an ecosystem are _____.
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Question 21
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Herbivores are _____.
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Question 22
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Which of the following is a producer?
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Question 23
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When you eat an apple, you are a _____.
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Question 24
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Consider this segment of a food web: Snails and grasshoppers eat pepper plants; spiders eat grasshoppers; shrews eat snails and spiders; owls eat shrews. The snail occupies the trophic level(s) of __________.
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Question 25
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Which of the following must be considered to determine the species diversity of a community?
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Question 26
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Which of the following would be considered a "small-scale" disturbance?
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Question 27
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Which of the following best illustrates ecological succession?
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Question 28
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In an ecosystem, almost all of the incoming energy will eventually be __________.
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Question 29
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The biggest difference between the flow of energy and the flow of chemical nutrients in an ecosystem is that __________.
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Question 30
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Most of the solar energy that reaches Earth __________.
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Question 31
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Which one of the following best describes the base of an energy pyramid?
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Question 32
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In any food chain, the top level of consumers is quaternary (fourth). Why are there almost never any fifth-level consumers?
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Question 33
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In ecosystems, organisms at the highest trophic levels usually contain less collective biomass than the organisms at lower trophic levels because __________.
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Question 34
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Why is a diagram of energy flow from trophic level to trophic level shaped like a pyramid?
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Question 35
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The relationship between biomass and primary productivity is that __________.
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Question 36
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In an ecosystem, the __________ is always greater than the __________.
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Question 37
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In general, the biomass in an ecosystem will be greatest at the trophic level comprising _____.
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Question 38
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Phosphate pollution of lakes and rivers __________
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Question 39
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Local conditions such as heavy rainfall or the removal of plants may limit the amount of nitrogen, phosphorus, or calcium available to a particular ecosystem, but the amount of carbon available to the system is seldom a problem. Why?
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Question 40
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Which of the following is a component of the carbon cycle?
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Question 41
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In the global carbon cycle, carbon flows from consumers to producers in the form of _____.
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Question 42
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Which one of the following refers to the nitrogen cycle?
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Question 43
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Bacteria are especially important in making _____ available to plants.
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Question 44
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The major source of nitrogen for most nonagricultural plants is __________.
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Question 45
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Atmospheric nitrogen (N2) is replenished through the process of _____ by _____.
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Question 46
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Nitrogen gas makes up nearly 80% of Earth's atmosphere, yet nitrogen is often a limiting factor for plant growth. Why?
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Question 47
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The phosphorus cycle lacks a(n) _____ component.
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Question 48
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Species found in only one place on Earth are _____ species.
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Question 49
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Of the lemurs found on Madagascar, _____ are endemic to the island.
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Question 50
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Regions with high concentrations of species, especially species that are endangered or threatened, are referred to as _____.
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Question 51
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Hot spots such as rain forests and dry shrublands, which make up less than _____ of Earth's land surface, are home to about _____ of all plant and vertebrate species.
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Question 52
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An assemblage of interacting ecosystems makes up a _____.
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Question 53
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Forest fragmentation __________.
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Question 54
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Bioremediation is the __________.
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Question 55
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Sustainable development __________.
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Question 56
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Biophilia is __________.
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