Ecology Test Review 1

Lions prey on zebras.

For the zebra population to survive how many zebras are needed compared to lions?

• Fewer zebras than lions.

• Many more zebras than lions.

• About the same number of zebras and lions.

• There would be no relationship between the number of zebras and lions.

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To keep our ecosystem healthy, we must keep our ________

• Carbon

• Stewardship

• Pollution

• Biodiversity

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Which factors determine what kind of a biome is found in a region?

• The climate and types of organisms that live there

• The depth of water and the distance from land

• The wave action and the salt content of the water

• All the above

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Which of the following describes why decomposers are important in all habitats?

• They perform photosynthesis.

• They recycle nutrients in dead organisms.

• They produce the food necessary for all plants.

• They produce the food necessary for all animals.

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What is the relationship between producers and consumers?

• Producers break down consumers.

• Consumers provide habitat for producers.

• Producers get energy from the consumers.

• Consumers get energy from the producers.

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Which of the following statements are true? Select all that apply.

• Matter is lost in each cycle.

• Human activity has no impact on cycles.

• Combustion is part of the carbon cycle.

• Matter moves continuously between biotic and abiotic parts of an ecosystem.

• Matter is neither created nor destroyed.

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A collection of organisms that belong to different populations but all live in the same area and interact with one another.

• population
• ecosystem
• community
• biosphere

A rabbit population has increased noticeably in the past ten years.  Which of the following is a reasonable hypothesis for this population growth?

• Competition for food has increased among rabbits.

• The rabbit’s available land has increased increasing available resources.

• Abnormal weather conditions have decreased water levels of the local ponds.

• An organism that relies on similar food sources has migrated into the area.

Answer explanation

All of the incorrect answer choices would lead to a decrease in the rabbit population (competing for food, decreased water levels)

An increase in land would give more space to the rabbits so that they would not be competing for space.

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Which situation is an example of competition that could be found in the ocean?

• algae blooms decrease as the number of fish increase

• two shark populations utilize the same fish population as their main food source

• plentiful oxygen leads to an increase in the number of reefs

• lack of sunlight due to changes in the seasons restricts the growth of certain plants

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Bacteria, fungi, and earthworms are examples of:

• scavengers

• carnivores

• decomposers