Streams and Rivers

Question 1

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

Revolt · Accepted Answer

B

Question 2

How do streams conserve biodiversity?a.they connect habitatsb.they are confined by a bank and a bedc.they inhibit fish migrationd.all of the above

Revolt · Accepted Answer

A

Question 3

Which of the following does not contribute to water pollution?a.forestryb.industryc.agricultured.none of the above

Revolt · Accepted Answer

D

Question 4

Explain how current and oxygen content affect the biodiversity of streams and rivers.

Revolt · Accepted Answer

Fast-moving water is usually better oxygenated because it mixes with the air, and moderate currents create varied habitats that support many organisms. Slow or stagnant water generally has less dissolved oxygen and may support less biodiversity, although some organisms are adapted to it.

Question 5

Riparian foliage _______.a.provides shade and shelter b.increases photosynthesis of aquatic plantsc.limits the organic matter present in rivers and streamsd.all of the above

Revolt · Accepted Answer

A

Question 6

Explain how the conversion of wetlands to farmland has impacted streams and rivers.

Revolt · Accepted Answer

Converting wetlands to farmland removes natural water filtration and storage. It increases runoff, erosion, sediment, nutrients, and agricultural pollutants entering streams and rivers, while also increasing flooding and destroying aquatic and riparian habitat.

Question 7

How is water introduced into rivers and streams?

Revolt · Accepted Answer

Water is introduced through precipitation, surface runoff, groundwater seepage and springs, and tributaries that flow into the river or stream.

Question 8

Which of the following is not a characteristic of the source of rivers and streams?a.high oxygen levelsb.freshwater fishc.cooler temperaturesd.murky waters

Revolt · Accepted Answer

D

Question 9

Compare the characteristics of rivers and streams.

Revolt · Accepted Answer

Rivers and streams are flowing freshwater bodies with a current, channel, bed, and banks. Streams are usually smaller, narrower, and shallower and often flow into larger streams or rivers. Rivers are larger, carry more water, and eventually flow toward a lake, sea, or ocean.

Question 10

Explain why the middle sections of rivers have the greatest biodiversity.

Revolt · Accepted Answer

The middle sections have the greatest biodiversity because they combine nutrient-rich water from upstream with adequate current, oxygen, sunlight, and diverse habitats such as pools, riffles, vegetation, and varied streambeds.

Streams and Rivers Answers

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