WorksheetsChanging Ecosystems
Total questions: 15
Worksheet time: 15mins
A pasture gradually returns to a forested state. This is secondary succession.
True
False
After lava covers the land, _________ occurs
primary succession
secondary succession
Final illustration (#8) shows
pioneer species
climax community
only biotic factors
only abiotic factors
A species that does not belong in a balanced ecosystem, comes in, and changes it (usually for the worse).
flagnship
umbrella
invasive
predator
A community with interacting abiotic and biotic factors.
Ecosystem
Keystone Species
Invasive Species
Aquifers
Land that is covered in water seasonally or permanently.
Wetlands
Aquifers
Marsh Grasses
Brackish Water
A species that plays a critical role in the health, maintenance, growth, or definition of an ecosystem.
keystone
invasive
engineer
predator
Saltwater Intrusion
The movement of saltwater into a freshwater ecosystem
When flood waters flood a city
Happens only during floods
Happens in rich soil
Brackish Water
No organisms live here
Crystal clear water
Transitional areas with a mix of saltwater and fresh water
Muddy water
How do beavers affect nonliving parts of ecosystems?
Beaver dams cause upstream flooding, creating deep ponds.
Beavers cut down trees to construct dams, allowing more sunlight to reach the forest floor.
Beaver dams alter how water flows through an ecosystem.
all of the above
Which of the following best describes a dynamic system?
A system that remains static over time
A system that changes constantly
A system that operates in a fixed manner
A system that lacks any structure or organization
What usually happens to an ecosystem after a sudden catastrophic change?
Rapid recovery and restoration to its original state
Immediate collapse and irreversible damage
Slow predictable change – succession
Complete regeneration within a short period of time
What is a natural cause for sudden catastrophic change to an ecosystem?
Human intervention
Pollution
Volcano, fire
Deforestation
Which of the following methods allows scientists to determine the impact of prairie dogs on an ecosystem?
Conducting surveys to count the number of prairie dogs in the ecosystem.
Analyzing the diet of predators in the ecosystem.
Observing the behavior of prairie dogs in their natural habitat.
By comparing ecosystems where prairie dogs have been lost, and observing changes.
Changing Ecosystems
The gradual process of change and replacement of the types of species in a community.
The immediate replacement of one species by another.
The process of a single species dominating an ecosystem.
The sudden extinction of all species in an ecosystem.
