Streams and Rivers — Unit test Answers

Where is light penetration in a river or stream likely to be lowest?a.the sourceb.the mouth c.the middle portiond.none of the above

The main difference between stream pools and ponds is that stream pools _______.a.have an observable currentb.are located inlandc.have no access to rivers or streamsd.are usually larger than ponds

Insects are most likely found in which aquatic zone?a.pelagicb.littoralc.benthicd.all of the above

Why might it be beneficial to regulate what species of plants and animals people are allowed to own in particular environments?a.Some species might become invasive and destructive if they escaped.b.Some species may be dangerous to humans.c.Nonnative plants and animals should only be used for commercial purposes.d.There is no reason to restrict an individuals’ right to own plants or animals.

Why are coral reefs overexploited?a.Coral is an important food resource.b.Coral and its organisms are valuable commodities in the aquarium industry.c.Coral reefs inhibit recreational activities.d.All of the above

The principle difference between where salt marshes and mangrove forests grow is the salinity of the water.

How has human use of salt marshes changed over time?a.Humans have come to value salt marshes and now seek to preserve and restore them.b.Humans now use drained salt marshes exclusively for agriculture.c.Humans have begun to use salt marshes for landfills.d.Humans have begun to use marsh land for housing and commercial development.

Legislation has been ineffective at preserving coral reefs.

The marine biome is the largest of all the ecosystems.

Which of the following is a way humans have impacted the rainforests, but not the tundra?a.oil drillingb.miningc.overgrazingd.logging

The negative impacts of nonnative species generally outweigh the positive impacts.

Streams have a detectable current, while rivers do not.

The abundance and variety of foods available in wetlands is a large contributor to their biodiversity.

Brackish water is common in freshwater wetlands.

Humans evolved in the Eocene period.