Quiz – Keystone Species

Question 1 of 6

1. Question

The largest animal in a food web only

A species with a disproportionate influence on its ecosystem

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The most numerous species in every habitat

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A species with no effect on other organisms

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The largest animal in a food web only

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Question 2 of 6

2. Question

A cloud passing over a forest

Pisaster starfish controlling rocky shores

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A single blade of grass in a field

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A grain of sand on a beach

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A cloud passing over a forest

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Question 3 of 6

3. Question

A permanent freeze in all interactions

Cascading collapses affecting many other species

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No change at all to the ecosystem

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An immediate increase in stability

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A permanent freeze in all interactions

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Question 4 of 6

4. Question

Nothing measurable changed

Their loss triggered ecological decline in the ecosystem

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The ecosystem became more stable at once

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Every other species thrived instantly

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Nothing measurable changed

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Question 5 of 6

5. Question

Match each keystone example to its role.

Sort elements

Controls populations on rocky shores
Keeps grazers of kelp forests in check
Prevents any one prey from dominating

Pisaster starfish

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Sea otter

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Keystone predator

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Question 6 of 6

6. Question

Match each concept to its correct statement.

Sort elements

Small in number but large in impact
Chain of losses after a key species goes
Protecting keystones can restore ecosystems

Keystone species

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Cascading collapse

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Conservation

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