What is a trophic cascade?

Trophic Cascades and Keystone Species in Ecosystems

Interactive Video
•
Biology, Science, Other
•
9th - 10th Grade
•
Hard

Patricia Brown
FREE Resource
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A type of waterfall formation
A method of energy transfer in plants
A series of changes in a food web caused by the addition or removal of a top predator
A process where nutrients are recycled in an ecosystem
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do sea otters indirectly affect kelp forests?
By eating kelp directly
By controlling the population of sea urchins that eat kelp
By providing shelter for fish
By increasing water temperature
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens to kelp ecosystems when sea otters are removed?
Kelp forests thrive and expand
Kelp forests are destroyed due to uncontrolled sea urchin populations
Sea urchin populations decrease
Fish populations increase
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why were wolves eradicated in Yellowstone in the early 20th century?
They were considered a threat to livestock
They were causing river pollution
They were damaging the forest
They were overpopulated
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What was one major consequence of removing wolves from Yellowstone?
Improvement in fish habitats
Increase in beaver populations
Decrease in elk populations
Destruction of vegetation in valleys
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How did the reintroduction of wolves affect the elk population in Yellowstone?
The elk population remained the same
The elk population increased
The elk population moved to other regions
The elk population decreased significantly
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What role do beavers play in the ecosystem after the reintroduction of wolves?
They decrease the fish population
They prevent birds from nesting
They increase the speed of river flow
They help create slow-flowing water areas by building dams
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