Ecology Unit Review

Match the following

• Commensalism

• One organism is helped tnat the other is harmed

• Parasitism

• Both organisms benefit

• Mutualism

• One organism benefits, the other is neither helped nor harmed

• Symbiosis

• A relationship among organisms

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A forest food web is shown. Which change would most likely cause a increase in the mouse population?

• An increase in the ladybird population

• A decrease in the fox population

• An increase in the snake population

• An increase in the number of producers

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A partial food web is shown.

Which two organisms compete with grasshoppers for biotic resources?

Select TWO correct answers.

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According to this food web, which organisms would the hawks and foxes compete for if the mice and insectivorous bird population decreased?

• squirrels, rabbits, and spiders

• rabbits, seed eating birds, and squirrels

• mice, seed eating birds, and toads

• mice, rabbits, and herbivorous insects

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In a given ecosystem, which factor would most likely lead to a decrease in the rabbit population?

• An increase in the number of predators

• A decrease in the number of predators

• An increase in the amount of available food

• A decrease in the amount of available shelter

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Considering the food chain, what would be the immediate effect of removing the primary consumers?

• An increase in the producer population

• A decrease in the producer population

• An increase in the secondary consumer population

• A decrease in the secondary consumer population

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Which of the following would most likely result in an increase in the population of carnivores in an ecosystem?

• Decreasing the amount of plant life

• Increasing the number of herbivores

• Introducing a new species of carnivore

• Reducing the number of water sources

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A student investigates how grasshoppers are affected by an environment changing due to drought conditions. Based on the data, which statement best predicts how subsequent populations of the grasshoppers may be affected by the changing environment?

• the body size of the brown grasshopper will decrease
• the population of green grasshoppers will increase
• the population of brown grasshoppers will increase
• the number of offspring of the green grasshoppers will increase

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Scientists gathered the following data on lizard populations for several years. The results are shown in the table. Which environmental factor most likely contributes to the change in lizard population? 

• increase in available water and food
• increase in shelter
• increase in predators
• increase in light

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Another name for a consumer is a

• heterotroph
• autotroph
• producer
• plant