Ecology Unit Test Review

Competition occurs when-

• niches overlap and population numbers are high

• all populations in an ecosystem occupy different niches

• resources are less abundant and population density is low

• the habitat is large and populations are spread out

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Which of the following describes a predator/prey relationship in a freshwater environment?

• dragonflies capture and eat mosquito larvae in a river

• algae in a lake makes its own food from sunlight

• male fish in a pond fight each other for females

• shares consume smaller fish they catch in the ocean

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Which explanation describes the importance of decomposers in a food web?

• they use photosynthesis to make their own food

• they return nutrients to the soil for use by plants

• they provide oxygen for animals to breathe

• they store energy for later use by plants and animals

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which type of symbiotic relationship occurs when multiple organisms seek the same resource?

• predation

• competition

• parasitism

• commensalism

organisms that are responsible for taking in light energy to make their own food are known as which of the following?

• heterotrophs

• decomposers

• producers

• consumers

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Tapeworms are organisms that live inside the intestines of animals like pigs, taking nutrients away from the pigs. In this relationship, what does the tapeworm represent?

• prey

• parasite

• consumer

• producer

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which of the following describes an interaction between a biotic and an abiotic factor?

• a black bear uses a cave for a winter home

• a squirrel gathers nuts to store for winter

• a vulture eats the remains of a wild pig

• a pair of birds build a nest in a tree

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NGSS.MS-LS2-3

Which of the following describes a change to an abiotic factor of a squirrel's habitat that could be harmful to it?

• deforestation learning to reduced nesting sites

• increase in the population of local predators

• increase in the population of food plants

• drought that depletes available water

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Photosynthesis occurs when-

• decomposers break down dead organisms

• plants take in light energy from the sun

• primary consumers eat plants for food

• secondary consumers eat primary consumers

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The ecosystem with the greatest diversity is the one that has the greatest:

• average annual rainfall

• coverage of land area

• elevation above sea level

• variety of living things

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