Human Impact Test Review (C)

The human population is increasing every day. How does the increase in population affect the natural resources that maintain humans?

• It decreases the amount of resources.

• It results in less demand fro resources.

The table shows some cases in which particular pollutants have decreased over time in the US. The data are given in millions of tons per year. Which reason best accounts for these changes during the time period?

• Laws and policies were enacted that limited the output of certain pollutants.

• Corporations and citizens voluntarily reduced the output of certain pollutants.

As populations grow, they need more resources, such as food. But Thomas Robert Malthus claimed that human populations and the resources they need increase at different rates. The graph illustrates his theory. What is happening at Point A?

• There are just enough resources for this population.

• There are more than enough resources for the population.

Use the chart to answer the question. If you have a very clean stream with little or no pollution, which insects will be present?

• Mayfly nymph and stonefly nymph

• hoglouse and bloodworm

Use the chart to answer the question. If you find no insects at all in a pond or stream, what can you conclude?

• water has slight pollution

• water is very polluted

Use the chart to answer the question. If you see caddis fly larvae and freshwater shrimp, what is the quality of the water?

• water has slight pollution

• water has medium pollution

Use the chart to answer the question. What pond insects would you find in little to no pollution?

• dragonfly nymph and damselfly nymph

• worm and rat-tailed maggot

Use the chart to answer the question. If you find a bloodworm, but no animals from group A or B, what would the pollution level be?

• water has little or no pollution

• water has medium pollution

Trees in rain forests are cut down so that the land can be farmed. Which substance in the atmosphere decreases in these regions because of deforestation?

• oxygen

• carbon dioxide

What effect would NOT occur in an ecosystem if humans cut down trees for resources?

• Competition between birds would increase for nesting sites.

• The number of producers would increase.