Community Stability

Because of their sensitivity to environmental conditions, _________________ are closely monitored. If their populations decline, it is a sign that something is going wrong in the environment.

• threatened species

• endangered species

• extinct species

• indicator species

Why are bees considered a keystone species?

• The honey they make supports the bear population

• They pollinate flowers that produce fruit which supports the ecosystem

• They sting when threatened

• They live in hives

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Why are some sharks considered a keystone species?

• Because they are a top predator

• They scare off smaller fish that may overgraze an area of sea grass

• They are tertiary consumers

• They are cartilaginous

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Based on the graph shown, how can you tell sea otters are a keystone species?

• as the sea otter population decreases, biodiversity increases
• as sea otter population increases, biodiversity increases
• changes in the sea otter population have little effect on biodiversity 
• the sea otter population dereases due to the presence of urchins

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What is the definition of a keystone species?

• A species that has a large impact on its habitat

• A species that is at the top of the food chain

• A species that is endangered

• A species that is found in Yellowstone National Park

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What is ecological succession?

• A slow change in an environment
• A change that takes days in an environment
• No change
• Abiotic change

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What is the difference between primary and secondary succession?

• Primary succession already has soil.
• Primary has soil and secondary does not
• soil is present in both
• primary has no soil and secondary has soil

Which is the correct order in primary succession?

• Rocks, Lichens & Mosses, Bushes & Shrubs, Trees
• Lichens & Mosses, Rocks, Trees, Bushes & Shrubs 
• Trees, Bushes and Shrubs, Lichens & Mosses, Lichens & Mosses
• Rocks, Grass, Trees, Bushes & Shrubs

The picture shows what type of succession?

• primary
• secondary
• tertiary
• quadanary

The picture shows what type of succession?

• primary
• secondary
• tertiary
• quadanary

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