Unit 6 Review Science

Decomposers are organisms that

• break down matter from dead plants and animals.

• use sunlight to produce food.

• feed upon living organisms.

• can only be seen using a microscope.

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The images above are the food webs of two ecosystems. Which ecosystem would be affected the most by losing its butterflies, and why?

• Ecosystem 1 because it has more plants that depend on the butterfly

• Ecosystem 2 because it has more insects that compete with the butterfly

• Ecosystem 1 because it has fewer kinds of plants, animals and insects.

• Ecosystem 2 because it has more kinds of plants, animals, and insects.

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Lauren was walking in the woods when she found a rotting log. When she looked closely at the log, she saw that a decomposer was working to break down the wood. Which could be the decomposer she saw on the log?

• mouse

• caterpillar

• mushroom

• grass

An Antarctic food web is pictured above. If the temperature of Antarctica rose and all of the fish died, what would most likely happen to the number of seals?

• The number of seals would not change.

• The number of seals would decrease.

• The number of seals would increase and then decrease.

• The number of seals would increase.

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If there were no decomposers, which of the following would most likely happen?

• Animals would start carrying out photosynthesis.

• The amount of dead plant and animal matter would decrease.

• Plants and animals would remain living for a longer period of time.

• Some plants may die due to a shortage of important nutrients.

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What happens to the matter that is broken down by decomposers?

• It stays at the decomposer level and is used over and over by those organisms.

• It is removed from the ecosystem and replaced by new matter.

• It becomes part of the soil and can no longer cycle through the ecosystem.

• It is recycled back into the ecosystem and can be used by plants to grow.

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Which of the following describes what is taking place in the process shown above?

• Organisms are using up some of the Sun's energy, causing the Sun to become weaker.

• Matter and energy are cycling through an ecosystem.

• Water is making one complete pass through the water cycle.

• Old rocks are being broken down, and new ones are being created.

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What would probably happen if the frogs were taken away from the pond?

• The pond would dry up.

• There would be fewer aphids, but more grasshoppers.

• There would be more aphids and grasshoppers.

• There would be fewer aphids and grasshoppers.

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All around the world, organisms are born. Then, they grow, die, and decay. Which of the following statements is true of the materials left by dead organisms?

• They can't be used for anything.

• They are only useful to decomposers.

• They can be used to produce new organisms.

• They are only useful to insects.

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Select the true statement about the cycling of matter through Earth's ecosystems.

• Cycling of matter began around 1976

• Only animals can cause matter to cycle through an ecosystem

• Cycling of matter occurs every day.

• Matter can only move from plant to plant in an ecosystem.

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