1.1 Vocab Practice

Which of the following best defines an organism?

• A group of animals that live in a specific area

• An individual life form, such as a plant, animal, or bacterium

• A nonliving factor in an environment

• A species that consumes other organisms

A population is described as:

• All living and nonliving things in an area

• A group of the same species living in a particular area

• A variety of organisms living together in a habitat

• A factor that affects the environment

Which of these is an example of a biotic factor?

• Sunlight

• Temperature

• Plants in a forest

• Rainfall

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What is the primary difference between a biotic factor and an abiotic factor?

• Biotic factors are always plants, while abiotic factors are always animals.

• Biotic factors refer to living components, while abiotic factors refer to nonliving components.

• Abiotic factors do not affect ecosystems, while biotic factors do.

• Abiotic factors are less important in ecosystems than biotic factors.

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Which scenario represents a population?

• A lion hunting a zebra

• All the fish of the same species in a lake

• A bird building a nest in a tree

• A group of foxes and rabbits living in a forest

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In an ecosystem, which of these would NOT be a biotic factor?

• A herd of deer

• A patch of algae in a pond

• A rotting log

• The water in a stream

How are biotic factors and organisms related?

• Organisms are specific examples of biotic factors.

• Biotic factors only include organisms that are producers.

• Organisms create abiotic factors in their environments.

• Biotic factors only refer to plants, not animals or microbes.

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What could lead to a change in a population within an ecosystem?

• A new predator enters the area.

• A river dries up during a drought.

• A disease reduces the number of individuals in the group.

• All of the above

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Which statement is true about biotic factors in an ecosystem?

• They only include large organisms like mammals and birds.

• They are essential for supporting life but are not alive themselves.

• They interact with abiotic factors to shape the ecosystem.

• They are less important than abiotic factors in maintaining balance.

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A scientist observes a decrease in a fish population. Which factor is most likely a biotic factor affecting this change?

• Increased water pollution

• Higher water temperature

• Introduction of a new predatory fish

• A storm that damages their habitat

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