Unit 1 Test Ecology

An ecosystem is:

• a community of living and non-living things interacting together

• a single animal living alone

• only the plants in a forest

• just the water in a pond

Limiting factors - _________________ (living) or _________________ (nonliving) factors that restrict the _________________, _________________, or _________________ of a population.

• biotic, abiotic, distribution, abundance, growth

• abiotic, biotic, increase, decrease, stability

• biotic, abiotic, migration, extinction, adaptation

• abiotic, biotic, reproduction, mutation, evolution

Examples of Density-Dependent Limiting Factors include:

• Competition, predation, disease

• Sunlight, temperature, rainfall

• Natural disasters, drought, fire

• Soil type, pH, mineral content

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Examples of Density-Independent Limiting Factors include:

• Natural disasters such as floods and fires

• Competition for food

• Predation

• Disease spread

A niche is:

• the role or position of an organism in its environment

• a type of ecosystem

• a physical place where an organism lives

• a group of similar organisms

A symbiotic relationship is:

• a relationship where two different species live together and benefit from each other

• a relationship where one organism eats another

• a relationship where organisms compete for resources

• a relationship where organisms avoid each other

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Types of Interactions: 1. Competition b. Example:

• Two animals fighting for the same food source

• A bee pollinating a flower

• A bird building a nest in a tree

• A fungus breaking down dead matter

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Types of Interactions: 2. Predation b. Example:

• A lion hunting a zebra

• A bee pollinating a flower

• Two deer fighting for territory

• A mushroom growing on a tree

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Types of Interactions: 3. Mutualism b. Example:

• Bee and flower

• Lion and zebra

• Tick and dog

• Hawk and mouse

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Types of Interactions: 4. Commensalism b. Example:

• A bird nesting in a tree

• A lion hunting a zebra

• A bee pollinating a flower

• A tapeworm in a dog

Tags

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