Ecosystems Exam Review

What limits the growth and reproduction of organisms and populations?

• Lack of competition

• Unlimited resources

• Abundance of predators

• Access to resources

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What results from changes in the amount and availability of resources like space, water and food?

• Decrease in nonliving factors

• Increased biodiversity

• Stable population sizes

• Changes in the maximum population of an organism

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Who are considered producers in an ecosystem?

• Organisms that consume other organisms

• Nonliving parts of an ecosystem

• Organisms that break down dead matter

• Organisms that produce their own food

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What drives competition among organisms?

• Mutualism

• Resource availability

• Predation

• Decomposition

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How is energy transferred when organisms consume other organisms?

• There is no transfer of energy

• Matter is rearranged when the organism is eaten, and used by the cells of the consumer.

• By decomposing

• Through sunlight

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Match the following

• This is an organism that breaks down and gains nutrients from dead organisms.

• Producer

• This organism eats primary consumers

• Secondary Consumer

• This is an organism that supplies matter and energy, also known as an autotroph.

• Tertiary Consumer

• This organism eats producers.

• Primary Consumer

• This organism eats secondary consumers.

• Decomposer

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All the living things in an ecosystem are the ​ (a)   factors. The nonliving things are ​ (b)   factors.

• biotic
• abiotic

Answer explanation

Bio = life

A = not

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Match the following

• omnivore

• eats other animals

• carnivore

• eats both plants and animals

• scavenger

• eats only dead, decaying organisms

• herbivore

• gets nutrients from breaking down the remains of other organisms

• decomposer

• eats only plants

​ ​ (a)   - Organisms that have similar features and can reproduce.

​ (b)   - A group of the same species that live in a certain area.

​ (c)   -  A combination of all the different populations that live and interact in the same environment

​ (d)   - All the living and non-living things that interact in one specific part of the environment.

• Species
• Population
• Community
• Ecosystem

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Match the following

• Herbivores

• A consumer that eats only producers/plants

• Decomposer

• A consumer that eats only meat

• Omnivores

• A consumer that eats both plants and animals

• Carnivore

• A bacteria or fungus that breaks down dead plants and animals

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