Unit I Preassessment EVS

You can see a typical food web here. Imagine that this food web exists in the woody area next to a farm.
The farmer sprays his crops with insecticides and the majority of the insects are killed. Predict the results
of the farmer's action on this food web.

• The flowering plants will grow uncontrolled.
  

• 
  Only the top level consumer, the owl, will experience a decrease in populations.
  

• 
  The plants will increase but the bird and rodent populations will get smaller without the insects
  as food.
  

• The owl population will grow very large but the other animal populations will decrease due to
  lack of food.

Which is the correct sequence of events in the nitrogen cycle?

• soil nitrogen → animals → plants → fungi
  

• atmospheric nitrogen → bacteria → plants → animals
  

• soil nitrogen → atmospheric nitrogen → plants → animals
  

• atmospheric nitrogen → plants → animals → Soil nitrogen

In the carbon cycle, carbon is transferred from animals to decomposers in all of the following ways
EXCEPT

• As waste.
  

• In dead carcasses.
  

• As carbon dioxide.
  

• In scraps of discarded food.

All of the listed human actions affect the nitrogen cycle with the exception of the

• Use of agricultural fertilizers.

• Use of pesticides on ranches and farms

• Production of sewage and animal wastes from farms.

• Removal of soil bacteria from irrigation or construction.

The snake that eats the frog on this food chain is called a ______________.

• primary producer

• primary consumer

• tertiary consumer

• secondary consumer

Consider the model of the food chain. Imagine there is an herbicide poison spill and all of the grass is killed. How will this influence the food chain model?

• The grasshopper will die out.

• All of the consumers will decrease.

• The tertiary consumers will increase.

• The grasshoppers will find some other food.

The biosphere is the highest level of organization in the hierarchy of life on earth. Rank the levels of
organization from most complex to simplest.

• organisms > populations > communities > ecosystems

• ecosystems > communities > populations > organisms

• ecosystems > organisms > communities > populations

• populations > communities > ecosystems > organisms

The food pyramid represents interactions in the water of Chesapeake Bay. Which organism represents the trophic level containing approximately 1% of the initial amount of solar energy acquired by the phytoplankton?

• Sharks

• Jellyfish

• Bluefish

• Zooplankton

The food pyramid represents interactions in the water of Chesapeake Bay. Which organism represents the trophic level containing approximately 0.1 % of the initial amount of solar energy acquired by the phytoplankton?

• Tuna

• Zooplankton

• Summer Flounder

• Jellyfish

Pictures W, X, Y, and Z represent levels of organization in an African savanna environment. Which picture is correctly paired with the correct level of organization?

• W represents a community.

• X represents a population.

• Y represents and organism.

• Z represents an ecosystem.