Lab: Environmental Changes in a Watershed

Question 1

energynutrients✔ pollution

Revolt · Accepted Answer

C: pollution

Question 2

Where did the pollution from the acid rain and factory in the virtual lab eventually end up?

Revolt · Accepted Answer

B: groundwater

Question 3

Which statements are true about point and nonpoint source pollution?Human activity causes point and nonpoint source pollution.Only nonpoint source pollution affects abiotic factors in a watershed.Point source pollution affects only the part of the lake or river near it.Both point and nonpoint source pollution affect biotic factors in a watershed.Point pollution flows through the bodies of water in a watershed but not through its land.

Revolt · Accepted Answer

A: Human activity causes point and nonpoint source pollution.; D: Both point and nonpoint source pollution affect biotic factors in a watershed.

Question 4

Lake Mojave is an ancient lake that has dried up and no longer exists in the Mojave desert in California.Which environmental conditions may have occurred to cause the disappearance of the lake and the organisms that live in it? Check all that apply.decrease in rainfall in the Mojave desertdecrease in temperature in the Mojave desertdecrease in runoff that flows into Mojave lakeincrease in blocked streams that flow into Mojave lakeincrease in pollution that was deposited into Mojave lakeincrease in the nonnative plant population in Mojave lake

Revolt · Accepted Answer

A: decrease in rainfall in the Mojave desert; C: decrease in runoff that flows into Mojave lake; D: increase in blocked streams that flow into Mojave lake

Question 5

Which environmental change caused all populations of the biotics factors (algae, mosquito larvae, minnow, trout, and heron) to increase?

Revolt · Accepted Answer

A: increase in runoff

Question 6

During the summer, when the land is brown and the grass is green, the population of mice decreases because mice are easily spotted by the organisms that eat them.How would this change affect the food web? Check all that apply.

Revolt · Accepted Answer

A: It will increase the grass population.; D: It will decrease the snake population.; E: It will increase the grasshopper population.

Question 7

Suppose this scenario was modeled in the lab. How would the populations of the biotic factors be affected? Check all that apply.

Revolt · Accepted Answer

C: Algae population will increase.; D: Trout population will decrease.; E: Minnow population will decrease.

Question 8

Question 8

Revolt · Accepted Answer

A,B

Question 9

Choose the correct answers from the drop-down menus. What are the rangers doing to restore the population of the Sierra Nevada yellow-legged frogs? If the organisms that preyed on and competed with the yellow-legged frogs were removed from the affected lakes, what would most likely happen to the population of the garter snakes?

Revolt · Accepted Answer

Selection 1: removing fish from the affected lakes; Selection 2: Its population will increase.

Question 10

animal✔ humanplant

Revolt · Accepted Answer

B: human

Lab: Environmental Changes in a Watershed Answers

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