WorksheetsEcosystems Standard 3
Total questions: 20
Worksheet time: 20mins
A student is investigating ecosystems. The diagram shows the fish tank that the student will use for her investigation. What change could the student make that would have the greatest effect on the ecosystem?
The student could add more water.
The student could add more rocks.
The student could add more plants.
The student could add more species.
The picture shows a model of an ecosystem. Which scenario would have the greatest effect on the organisms in this ecosystem?
More birds begin to migrate into the area.
Fish lay more eggs in the underwater plants.
Water in the pond of the ecosystem disappears.
A tree in the ecosystem dies and begins to rot.
What would most likely happen to the populations of organisms in the forest ecosystem if there were no rain for a very long time?
The populations of all the forest organisms would decrease because producers would not be able to survive to supply nutrients to the consumers.
The grass and tree populations would increase because they only need sunlight and soil to get nutrients.
The populations of all the forest organisms would remain the same because water only affects other nonliving factors.
The hawk and rabbit populations would increase because they would not have to compete with grass and tree populations for water.
In an ecosystem where some birds depend on insects to survive, which of the following is most likely to happen if someone sprays a pesticide to control the insect population?
The bird population will increase.
The bird population will decrease.
The bird population will decrease, then increase.
The bird population will increase, then decrease.
Gopher tortoises typically set up one path for travel and do not like to go off of that path. Since humans have built roads and buildings on gopher tortoise paths, the tortoises have had to adapt. Which of the following is true?
They changed their path to go around humans.
They travel the same path as before.
They rely on humans to carry them across paths.
They no longer travel any path.
What would happen if a large number of rain forest plants were cut down?
The animals would have less light.
There would be more animals.
The animals would have less oxygen.
There would be more shelter.
Lions hunt and eat antelope that graze in the African grasslands. If Africa has no rain for a long period of time, and plants die, what will happen to the population of lions?
It will increase.
It will decrease.
It will remain unchanged.
It will adapt to eating plants.
A bison's primary food source is grass. If the amount of grass in a region where bison live were reduced, which of the following would happen?
The number of bison would increase.
The number of bison would decrease.
The number of bison would increase at first and then decrease.
There would be little or no change in the number of bison.
If humans build a large bridge over an area that has many small plants, what will most likely happen to the small plants?
They will attract more nesting birds.
They will grow better in the darkness.
They will grow taller because they will get more food.
They will die because they will not get as much sunlight.
How would all of the mammals moving out of a habitat most likely affect the snake population in that habitat?
The population would increase because there would be more room to find food.
The population would decrease because there would be less food for them to eat.
The population would increase because there would be more places to find shelter.
The population would decrease because there would be less competition for shelter.
The picture shows a snowshoe hare whose fur color changes from brown to white each winter. What would most likely happen if the habitat had little snow one year?
The fur of the hare would be longer to help it hide.
The fur of the hare would be thicker to keep it warm.
The fur of the hare would be a darker color that year.
The fur of the hare would be a lighter color that year.
A logging company cuts down trees in an area of the forest. Which of the following is the least likely result of this change?
More species will make homes in the area.
Animals will compete more with others for food.
Many species will have to move to find shelter and food.
Some animals living in the area will die because they cannot find shelter.
Which of the following is the least likely effect of humans moving into a swift fox habitat?
The swift foxes will die.
The swift foxes will thrive.
The swift foxes will move to another habitat.
The swift foxes will change to survive in the habitat.
What would most likely happen to the animals living in a swamp if a developer builds new homes in the area?
They will lose their habitat.
There will be more food available.
There will be an increase in population.
They will have more places to build nests.
How might the number of sharks be changed by the removal of tuna in this area of the ocean?
They will increase in number because now they do not have to fight as much for food.
They will decrease in number because they no longer have their primary food source.
They will increase in number because they will no longer be hunted by tuna.
They will decrease in number because the mackerel will start eating them.
Can one individual person have an impact on their environment?
Yes, because everything impacts an environment, no matter how small.
Yes, because each environment centers around an individual person.
No, because only plants and animals make an impact on an environment.
No, because only groups of people make an impact on an environment.
As farmers started spreading across America, they drastically changed the look of the environment. Which of the following was NOT an effect of this spread?
Wild animals fled to less-populated areas.
Trees were cut down to make room for crops.
Grasslands were dug up and turned to dirt fields.
The number of wild animals increased.
People cut down trees for many reasons. If humans destroy all the trees and plants on the planet, what would most likely happen?
The animals would be fine, but the humans would not survive.
The humans would be fine, but the animals would not survive.
Every organism would die because there would not be any oxygen to breathe.
Populations of organisms would increase because there would be more space.
The picture shows a food web. If farmers sprayed a pesticide on the grass that killed grasshoppers, which species would be hurt the quickest?
lizards and foxes
small birds and rabbits
lizards and small birds
field mice and rabbits
The picture shows a food chain. What will most likely happen if the grass in this environment disappears?
The number of rabbits will increase because there will be more foxes to eat.
The number of foxes will increase because there will be more rabbits to eat.
The number of foxes will decrease because they will run out of grass to eat.
The number of foxes will decrease because they will run out of rabbits to eat.
