Lab: Environmental Changes in a Watershed Answers

Throughout the reflection, make sure that you have the copy of the student guide, PDF or Word and your data tables. Fill in the terms that complete the statements. In this lab, you observed how changes in the environment can affect the health of a watershed. You saw how two types of entered and flowed through the watershed. You also predicted how activity affected food chains, diagrams that show how energy is passed from one biotic factor to another through the foods they eat.

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

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.

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.

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

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.

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

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?