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Science
7th
grade
Unit 07: Investigating Organisms and Their Environments
21 questions
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- 1. Multiple Choice
Students in two different schools created gardens at their campus. They only planted native plants that do not require extra care. Students from each of the schools were asked to sketch some of the native plants included in their gardens. Sample images from each school are included below.
Which of the following characteristics of the garden environments pictured above has the greatest affect on the types of plants that grow in them?
Temperature
Amount of rainfall
Amount of light
Space
- 2. Multiple Choice
If your local environment begins to turn into a desert, what will most likely happen to the organisms in the environment?
The populations of organisms currently existing in the environment will increase.
The populations of organisms currently existing in the environment will not be affected.
The new desert environment will be unable to support any populations of organisms.
A different variety of organisms will be supported rather than the ones that currently exist.
- 3. Multiple Choice
Which statement best describes the comparison of lake and ocean environments?
The lake and ocean environments support the same organisms because they are both water and are made up of the same elements.
The lake and ocean environments support different organisms because most freshwater organisms cannot live in saltwater.
The lake and ocean environments support the same organisms, but they will look different because of the type of water.
The lake and ocean environments support different organisms because ocean organisms are blocked by land from getting into lakes.
- 4. Multiple Choice
The Texas Mock Orange is a type of flowering plant that is only found growing naturally in Texas. Which of the following is the most likely reason that they only grow naturally in Texas?
The type of animals that eat the Texas Mock Orange are not found in other environments.
The amount of sunlight the Texas Mock Orange needs is not found in other environments.
The type and amount of water the Texas Mock Orange needs is not found in other environments.
The types of organisms that pollinate and help the Texas Mock Orange reproduce are not found in other environments.
- 5. Multiple Choice
5 Four students were asked to observe microhabitats of their schoolyard and describe how microhabitats are able to support different varieties of organisms. Their observations and responses are shown below.
Which student best describes how microhabitats are able to support a variety of organisms?
student 1
student 2
student 3
student 4
- 6. Multiple Choice
A student rolled over a wooden log and made the following observations.
Which observations support the student’s claim that the log represents a microhabitat?
Observation 1 and 2
Observation 1, 2, and 3
Observation 1, 2, and 4
Observation 3 and 4
- 7. 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.
- 8. 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
- 9. 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
- 10. 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.
- 11. 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
- 12. 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.
- 13. 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
- 14. 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
- 15. 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
- 16. 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.
- 17. 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
- 18. Multiple Choice
A flower bed is created at a school so flowers can be planted in the autumn.
Over the summer, the flower bed is ignored. Which of the following should the students expect to find when they come back to school?
- 19. 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
- 20. Multiple Choice
In2011,firesinBastropCounty,Texaswerethemostdamaging wildfires in Texas history. The fire spread through the pine trees and scorched nearly 5,700 acres of Bastrop State Park. The majority of the Houston toad’s habitat was lost, and the Lost Pines Forest was greatly affected.
As ecological succession began, which of these most likely appeared in
the Bastrop forest area first?
Shrubs and trees
Newly developed topsoil
Weeds and grasses
Lichens on fallen trees
- 21. Multiple Choice
Students observe ecological succession of a field that has been left bare. Which of the following are the students likely to observe first?
Growth of shrubs and trees
Formation of topsoil
A mature grassland community
Growth of grasses and weeds
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