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WorksheetsUnit 1 test Part 2
Total questions: 10
Worksheet time: 19mins
An unusually warm spring leads to an increase in the number of mice in a fertile valley. One result of this population explosion is the loss of farmers’ crops due to consumption by the mice. What would be another likely result of the population increase of the mice?
Mice will fill a different niche in the ecosystem.
The following year the spring will be warm again.
Birds of prey that eat mice will become more numerous.
Animals that compete with mice will adapt to find new niches.
As the human population rises, the demand for popular fish, like tuna, in grocery stores and restaurants has also gone up. Many people enjoy eating these types of fish. How might increasing the number of tuna caught affect the tuna fishery over the long term?
The tuna population may decrease, but then rebound after the tuna adapt.
The tuna population as a whole may decrease, but the demand for tuna will also decrease.
The tuna population may decrease; therefore, fishing restrictions will need to be implemented.
The tuna population as a whole may decrease, but individuals may be larger due to less competition.
The graph shows the relationship of a lynx population to a snowshoe hare population. Which of the following statements best explains why the lynx population usually increases after the snowshoe hare population increases?
Lynx move over large areas to hunt snowshoe hares.
The lynx birth rate increases when more snowshoe hares are present.
High snowshoe hare populations cause a decrease in the lynx birth rate.
The populations of both animals decrease during the winter and increase during the summer.
Sienna is conducting an experiment. She plants five seedlings in a sealed container. She pumps into the sealed container a mixture of 50% carbon dioxide (CO2) and 50% oxygen gas (O2). She allows the plants to grow for one week. After one week, she takes a sample of gas from the container and analyzes it. What would Sienna most likely find?
The concentration of oxygen and carbon dioxide have both increased.
The concentration of oxygen and carbon dioxide have both decreased.
The concentration of oxygen has increased, while the concentration of carbon dioxide has decreased.
The concentration of oxygen has decreased, while the concentration of carbon dioxide has increased.
An earthquake that occurs near a river system weakens the walls of dams that beavers have built and the dams collapse. If another earthquake does not occur, what will most likely happen?
The beavers will not have a suitable habitat available and will gradually decline in number.
The beavers will adapt to the change and live in the river system without any dams present.
The beavers will rebuild the dams and the area will return to how it was before the earthquake.
The flow of the river will change and the area will be taken over by other animals such as fish and reptiles.
Salt water is an abundant resource but is unusable for irrigation and drinking. As demands on freshwater sources increase, the use of desalination processes to remove salt from ocean water is increasing. A concern of desalinating water is the large amount of recovered salts that are returned to the ocean. Which of the following describes the most likely impact of desalination on the surrounding ocean environment?
Methane gas would pollute the ocean environment as shoreline organisms begin to die and decay.
Alteration in ocean salt levels would cause loss of species and unbalanced populations in marine food webs.
Nonrenewable resources in the ocean environment would become depleted and upset the ecosystem's balance.
Increased levels of salts and minerals in the ocean would result in overpopulation of marine bivalves due to strengthened shells.
An unusually warm spring leads to an increase in the number of mice in a fertile valley. One result of this population explosion is the loss of farmers’ crops due to consumption by the mice. What would be another likely result of the population increase of the mice?
Mice will fill a different niche in the ecosystem.
The following year the spring will be warm again.
Birds of prey that eat mice will become more numerous.
Animals that compete with mice will adapt to find new niches.
Which of these situations would lead to a decrease in the number of producers in an ecosystem?
an increase in the number of predators
an increase in the number of herbivores
an increase in the number of scavengers
an increase in the number of decomposers
Industries often spring up along major rivers, such as the Willamette in Central Oregon. Some of these industries used PCBs (toxic, cancer-causing chemicals), which are not biodegradable. If PCBs escaped into the river in large amounts and entered the lower levels of the food chain, what would be the likely outcome?
All species, except scavengers such as riparian crustaceans, would be harmed by the PCBs
Only the small fish and crustaceans that are most exposed to the PCBs would be significantly harmed.
Over time, PCBs would collect in top predators such as salmon, making them unsafe for human consumption.
The PCBs would become harmless as they break down over time with exposure to the forces of nature and the environment.
A great deal of research is being done to make plastic wastes useful by reusing the plastic for purposes other than the plastic’s original use. Which statement below best describes the impact reusing, rather than recycling, plastics might have on our environment?
Natural resources can be conserved or made available for other uses.
More plastic will have to be produced to make up for the lost plastic reused for something else.
Landfills will have new materials to dispose of, making the present systems of disposing wastes obsolete.
The new plastic materials will be every bit as nondegradable as the plastics they were made from, causing large amounts of wastes.
