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- 1. Multiple Choice
Students created the table below based on observations of two microhabitats near their school.
Based on the information above, what is the best explanation for the different variety of organisms in the two microhabitats?
The rotting log and grassy area are in different biomes.
Conditions for survival are different in each location.
The rotting log has predators while the grassy area does not.
There is more space in the rotting log than in the grassy area.
- 2. Multiple Choice
The more diverse an ecosystem is --
the more threatened its populations are
the more similar the species will be
the more sustainable it is
the fewer varieties of species are present
- 3. Multiple Choice
Refer to the food webs above. If the grasses in each ecosystem are attacked or killed by a disease, which ecosystem will most likely survive?
The prairie ecosystem, because fewer organisms eat grass
The tundra ecosystem, because there is a variety of producers
The prairie ecosystem, because there are fewer top predators
The tundra ecosystem, because it has more herbivores
- 4. Multiple Choice
Which statement below best describes how biodiversity contributes to the sustainability of an ecosystem?
A variety of plant and animal species allows for more survivors of a natural disaster.
Having more species in an ecosystem allows the human population to increase in size.
Low biodiversity reduces the competition for resources, which helps native species survive.
Fewer species in the ecosystem reduces the likelihood that disease spreads through the ecosystem.
- 5. Multiple Choice
Which of the following situations contributes to the sustainability of an ecosystem?
Increase in biodiversity
Decrease in biodiversity
Extinction of a population from the ecosystem
Removal of many populations of organisms
- 6. Multiple Choice
The food webs below model relationships among organisms in two ecosystems.
Students were asked to make a claim supported with evidence to answer the question, “Which ecosystem would be most sustainable if all the grasses died from severe drought?” What claim is valid and supported by the evidence?
The forest ecosystem is most sustainable because there are more top predators.
The grassland ecosystem is most sustainable because there are fewer organisms that eat grass.
The forest ecosystem is most sustainable because most of the animals can eat other organisms.
The grassland ecosystem is most sustainable because there is less competition for food.
- 7. Multiple Choice
Which event would most likely cause an ecosystem to have the lowest biodiversity and population sizes 3 years later?
Clearing land for a highway
A river floods a cornfield
A forest fire destroys the plant growth
A lava flow creates a new section of land
- 8. Multiple Choice
The role of a pioneer species in primary succession is to change a bare habitat into one that is suitable for other organisms. A species that is responsible for primary succession in an ecosystem is most likely able to —
survive any predator
migrate during the winter
live at high altitudes
carry out photosynthesis
- 9. Multiple Choice
Which of the following sequences most likely represents ecological succession on a recently abandoned wheat field?
grasses → flowering plants → shrubs → native trees
native trees → shrubs → flowering plants → grasses
shrubs → grasses → native trees → flowering plants
flowering plants → native trees → shrubs → grasses
- 10. Multiple Choice
What is the relationship between ecological succession and equilibrium in an ecosystem?
Ecological succession leads to equilibrium in an ecosystem.
Ecological succession prevents ecosystems from ever reachingequilibrium.
There is no relationship between ecological succession and equilibrium.
Ecological succession and equilibrium are the same thing.
- 11. Multiple Choice
A hurricane hits a coastal prairie and destroys the habitat. Years later, there is an appearance of small plants with rapidly spreading roots.
This vegetation describes —
a microhabitat
primary succession
secondary succession
biodiversity
- 12. Multiple Choice
When forest fires destroyed many of the pine trees in Bastrop State Park, the burned areas began secondary succession. What is the role of succession in this example?
Creating new soil by chemical and physical weathering of rocks
Restoring the ecosystem through grass, shrub, and tree stages
Changing the landscape to be more fire resistant in the future
Opening the land for new uses like farming and raising livestock
- 13. Multiple Choice
Which choice describes an animal best suited for a cold enviroment?
eyes and nostrils on the top half of the head
feet with flattened, webbed toes, climbing smooth surfaces
torpedo shaped body, for fast swimming
two layers of fur, inner insulates & outer protects from weather
- 14. Multiple Choice
A good adaptation for living in a grassland would be
the ability to hibernate
the ability of plants to grow very high to reach the sunlight
thick, insulating fur
the ability of plants to regrow after prairie fires
- 15. Multiple Choice
How does secondary succession help restore equilibrium to a region destroyed by a flood?
It increases the number and types of species
It brings back species from extinction
It stops the other flood from occurring
It decreases the rate of evolution
- 16. Multiple Choice
Coarl reefs and their inhabitants are suffering due to pollution and other factors. What would be the most likely result if some of the species in a coral reef area were destroyed?
Other organisms would move into the coral reef area.
The coral reef would be allowed to flourish without so many fish and plants.
The coral reef would begin to deteriorate without the variety of fish and plants necessary to maintain balance.
The waters surronding the coral reef will become cool with fewer organisms living there.
- 17. Multiple Choice
Students see crickets, ants, field mice and owls in a dry, grassy field, but no frogs. Which change would MOST likely allow frogs to live in the field?
a warm summer that increases the number of insects in the field
a diseae that reduces the number of owls that live in the field
a fire that burns away the tall grass that covers the field
a flood that causes a new stream to run through the field
- 18. Multiple Choice
A plant with broad, flat leaves is BEST adapted for
conserving heat in a tundra
collecting water in a desert
avoiding insects in a prairie
absorbing light in a rainforest
- 19. Multiple Choicea stable ecological community that has reached equilibriumecological successionclimax communitysecondary successionpioneer speciles
- 20. Multiple Choice
What effect does the increase in human population most likely have on the biodiversity of the plant species found in the rainforest?
As human population increases, the succession in the rainforest leads to increased biodiversity
As human population increases, the diversity of larger rainforest plant species increases
As human population increases, the number of individual rainforest plant species increases
As human population increases, the diversity of all rainforest plant species decreases.
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