Topic 9 Part 2 Review

What would happen in a forest of most of the tall trees were removed?

• The small plants would die out.

• The small plants that grew under the trees would grow in number.

• The forest would become a desert.

• It would rain more in the area.

If water were to disappear from an ecosystem, would would be the most likely effect?

• The plants in the area would increase.

• Animals and plants would not be able to survive.

• Plants would produce their own water.

• Plants would consume animals.

What is a harmful way organisms impact the environment?

• Invasive zebra mussels eat the food of native animals.

• Installing solar panels on homes.

• Plants releasing oxygen into the atmosphere.

• Cows fertilizing fields, returning nutrients to the soil.

What is the most likely reason the deer population is decreasing in our area?

• increase of yearly precipitation

• increase in grasses and shrubs

• decrease in yearly precipitation

• habitat loss due to clearcutting for building houses

What will likely happen if the hawk population disappears due to loss of habitat?

• The snake population will decrease.

• There will be no change in the food change in the ecosystem

• The snake population will increase.

• The grasshopper population will increase.

Which two animals are competing for the same food source?

• inchworms and robins

• merlins and robins

• inchworms and wolves

• robins and merlins

Which is an example of HUMANS reducing the size of a habitat?

• a thunderstorm causes flooding and reduces the local plant population

• a hurricane affecting the population of sea birds

• lightning starting a forest fire

• a dam is built that blocks fish from reaching breeding grounds

Which action is most likely going to produce a positive influence on an ecosystem?

• protecting native species by establishing national parks

• cutting trees to build new stores

• paving land to make a new parking lot

• overfishing in a lake

True or false:

Humans compete with other organisms for food in a food web.

• True

• False

Completely removing a species from an ecosystem would have a _____________ effect on the ecosystem's food web.

• positive

• negative