Name____________________________

AP Biology – 10-7

Ecosystem Worksheet

Cycles and Energy Flow

Study Sheet

Notes and Biology- Curtis and Barnes

Homework for Wednesday.  Take notes from your book on your Community Outline from Purves.

 

Answer the following questions about ecosystems

 

  1. Nitrogen is _______________% of the atmosphere.
  2. The bacteria that are able to capture atmospheric nitrogen and make ammonia are engaged in the process called_______________________________.
  3. These bacteria live in the roots of plants like _________________________.
  4. The name of the bacterium that does this process is _____________________
  5. Ammonia is a toxic molecule so it is converted into ions that can be used by plants
  6. The production of nitrites and nitrates to make a useable form of nitrogen in the environment is known as ____________________________
  7. The____________________________bacteria converts ammonia to nitrite.
  8. _______________________________converts nitrite to nitrate.
  9. The nitrates are used by the plants to make the following molecules

 

 

 

  1. The production of molecules of life by the plants is known as __________________________.
  2. ____________________is the release of excess nitrogen by a bacterium after is has used the nitrogen to make its own amino acids for proteins.
  3. When decay occurs this process takes place.
  4. Phosphorous does not have a _____________________________.
  5. Phosphorous is released into terrestrial environments from

___________________________

 

___________________________

 

___________________________

 

 

and into water by

 

_______________________________________________

 

 

  1. Phosphorous is used to make these important molecules

 

  1. Carbon dioxide is ____________________% of the atmosphere.

 

  1. It is removed from the atmosphere and fixed into molecules in this step of photosynthesis. ___________________________________

 

  1. Organisms that use sunlight and convert the energy into molecule are referred to as

 

_________________________________________.

 

  1. Photosynthesis has two steps

 

a.

 

b.

 

  1. Light is converted into chemical molecules.  Those molecules are

_________________

 

_________________

 

  1. The function of the pigment chlorophyll A is to ________________sunlight.

 

  1. Organisms that form the basis of a food chain or food web are referred to as

 

_______________________________.

 

  1. Organisms that eat producers are referred to as ___________________________or _______________________________
  2. What are trophic levels

 

 

 

 

  1. What are the three types of pyramids that represent trophic levels?

 

 

 

  1. What is the efficiency of energy transfer?  How does it vary from level to level?  Which is the most efficient?

 

 

 

  1. What is an inverted pyramid?

 

 

  1. What is the difference between a food chain and a food web?

 

 

 

29.  CO2 in the atmosphere has warmed the earth and kept the temperature habitable.  This is known as the ________________________________.  The burning of fossil fuels which releases more CO2 into the atmosphere can cause an elevation in the earth’s average temperature.  This is referred to as ______________________________________.

 

 

  1. What are the gaseous forms of sulfur?

 

 

  1. Why do organisms require sulfur?

 

 

  1. Sulfur can enter the atmosphere by these processes both natural and man made.

 

 

 

  1. Water in the atmosphere and sulfur can combine to make this .______________________
  2. This impacts the earth because it

 

 

 

 

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