Ecosystems Study Guide

What is a decomposer?

• an organism that breaks down dead organisms for energy

• an organism that makes its own food

• an organism that eats other organisms

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What is a food web?

• a model that contains many food chains

• a model that contains one food chain

• a model that shows where the sun gets its energy

• a model that shows how decomposers break down organisms

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What is the source of all energy?

• water

• food

• decomposers

• sun

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LIVING things in an ecosystem ….

• biotic

• abiotic

• ecosystem

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Rocks, air, sunlight and water are examples of ….

• an ecosystem

• biotic factors

• abiotic factors

If humans over-hunted a population of insect-eating birds, what immediate change would likely be seen in the area?

• Increased seedling germination

• Increased populations of insects

• Migration of small mammals

• Severe loss of vegetation

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What would most likely happen if an ecosystem no longer received sunlight?

• The number of herbivores would increase.

• The number of plants would increase.

• All organisms would adapt.

• All living organisms would eventually die.

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What do scientist call organisms that are not native to an ecosystem and cause harm to native organisms?

• native plants
• invaders
• invasive species
• natural species

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Decomposers are living things...

• True

• False

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Some non living things needed for an ecosystem to survive are...

• sunlight

• temperature

• water

• all of these are needed

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