IB Biology Topic 5

Primary succession occurs in areas with:

• very little soil

• lots of soil

• no soil

• soil that has been disturbed

What best describes the term succession?

• rapid changes that create an ecosystem overnight

• gradual changes over time to fully create or restore and ecosystem

• forest with the tallest trees

• the rate species produce offspring

Why do grasses appear before shrubs in ecological succession?

• loosen the dirt for new trees to take roots?

• provide food for animals returning to the area

• require plenty of sunlight to make their own food

• can grow even in areas with shallow soil

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A system made up of organisms interacting with one another

• biology

• society

• ecosystem

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The non-living parts of an ecosystem, such as water, sun, & oxygen are called 

• habitat

• abiotic factors

• biotic factors

• ecology

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All the populations in an ecosystem are called a 

• climate

• population

• community

• habitat

The living factors of an ecosystem, such as plants, animals, & fungi are called

• biotic factors

• abiotic factors

• ecosystem

• population

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An important abiotic factor in ALL ecosystems is the 

• ecology

• climate

• plants

• animals

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All life on Earth exists in a region known as 

• an ecosystem

• a biome

• the biosphere

• ecology

Autotrophs are organisms that

• rely on other organisms for their energy & food supply.

• consume plant & animal remains and other dead matter.

• use energy they take in from the environment to convert inorganic molecules to organic molecules.

• obtain energy by eating only plants.

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