Biology Unit Two Review

90% of the energy that gets lost as you move up a food pyramid or chain gets lost as

• pollution to the environment

• heat to the environment

• energy for decomposers

• gets recycled

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Non-living factor that affects an ecosystem

• biotic factor
• abiotic factor
• food chain 
• biome

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What percentage of energy is passed on to the next trophic level?

• 5%

• 10%

• 50%

• 90%

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In some environments, wolves prey on deer for their source of food. If all of the wolves were taken from the environment, what would most likely happen to the deer population?

• A The deer population would increase and begin to compete for food.

• B The deer population would become larger and healthier animals.

• C The deer population would decrease, because there would be an increase in disease.

• D The deer population would change color, because they would not have to hide from wolves.

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When brown tree snakes were accidentally introduced onto the island of Guam, they had no natural predators. These snakes sought out and ate many eggs of insect-eating birds. What probably occurred following the introduction of the brown tree snakes?

• The insect population began to seek a new food source.

• The bird population increased.

• The bird population began to seek a new food source.

• The insect population increased

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The living parts of an ecosystem

• Biotic factors

• Abiotic factors

• Mother Earth

• Flowers

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Which is an example of a parasitic relationship?

• a bee pollinates a flower
• a tapeworm takes nutrients from a dog
• an orchid lives in a tree but does not harm the tree

Barnacles grow on whales.  Whales give the barnacles a place to live but the barnacles do not help or harm the whale.  Which type of relationship is this?

• commensalism
• mutualism
• parasitiesm

What does every food chain start with? (Even if it's not drawn or written there!)

• producers
• sun
• consumer
• decomposers

The rabbit in this food web would be considered a:

• Decomposer
• Producer
• Secondary Consumer
• Primary Consumer

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