WorksheetsScience 8.12BC Quiz
Total questions: 20
Worksheet time: 10mins
What is the first type of organism to appear during primary succession?
Trees
Pioneer species
Grasses
Large animals
How does secondary succession differ from primary succession?
Secondary succession starts where soil already exists.
Secondary succession begins without any soil.
Secondary succession takes longer than primary succession.
Secondary succession removes pioneer species.
Which event is most likely to lead to primary succession?
A wildfire in a forest
A hurricane flooding a coastline
A volcanic eruption creating new land
A forest being cleared for farming
What do pioneer species do in primary succession?
Create soil for other plants to grow
Remove competition between species
Stabilize populations of large animals
Provide shade for larger plants
During primary succession, what increases over time?
Soil quality and plant diversity
Soil moisture and water levels
Plant size and animal populations
Population stability and competition
Which is a similarity between primary and secondary succession?
Both begin with the appearance of grasses.
Both occur after an ecosystem disturbance.
Both begin with the presence of soil.
Both rely on human activity to start.
Which disturbance would lead to secondary succession?
A volcanic eruption covering land with lava
A flood damaging a forest
A glacier retreating and exposing bare rock
An earthquake lifting ocean sediment to the surface
What factor allows secondary succession to happen faster than primary succession?
Presence of water
Presence of soil
More sunlight
Fewer pioneer species
What happens to species diversity during secondary succession?
It decreases.
It increases over time.
It remains the same.
It disappears completely.
In secondary succession, which plants are likely to grow first?
Small grasses and shrubs
Large trees
Pioneer species like mosses
Algae in shallow water
How can wildfires help ecosystems recover?
By removing invasive species
By creating space for new plants to grow
By removing soil for pioneer species to grow
By preventing large trees from growing back
What is the typical long-term outcome of ecological succession?
A stable ecosystem with diverse species
A permanent loss of plants and animals
A decrease in population sizes
Constant competition among organisms
What is the connection between species diversity and succession?
Diversity decreases as ecosystems develop.
Diversity increases as ecosystems stabilize.
Succession has no impact on diversity.
Succession reduces competition, lowering diversity.
In primary succession, why does it take time for trees to grow?
Trees require more sunlight than pioneer species.
Trees need soil, which takes time to form.
Trees only grow after animals return.
Trees need large amounts of water, which is scarce.
Why is soil important during primary succession?
It helps pioneer species grow.
It allows larger plants to take root.
It reduces competition among plants.
It stabilizes the ecosystem immediately.
A volcanic eruption creates new land. After 200 years, trees and grasses cover the area. What was essential for this change?
Removal of competition
Soil formation by pioneer species
Increased sunlight exposure
Reduced population sizes of animals
What happens when a farmer abandons a field?
Grasses and shrubs grow first, followed by trees.
Soil erodes and plants are unable to grow.
Only pioneer species like mosses grow back.
The ecosystem restarts primary succession.
What does biodiversity mean?
The variety of living things in an ecosystem
The amount of energy in a food web
The number of plants in a habitat
The stability of the soil in an area
How does biodiversity make ecosystems more stable?
It increases competition between species.
It provides more food sources and helps recovery.
It removes invasive species.
It decreases sunlight competition.
An ecosystem with high biodiversity is hit by a flood. What is most likely to happen?
The ecosystem recovers quickly due to its diverse species.
The ecosystem collapses because floods harm biodiversity.
The ecosystem loses all life and restarts primary succession.
The ecosystem becomes unstable and loses populations.
