Directions: 1. Based on the food chain relationships denoted by the arrows in the food web diagram, list each each plant/animal in the chart and state their role in the food chain: primary producer, primary consumer, secondary consumer or tertiary consumer.

2. Using the chart that follows the web, rank the relative concentration of DDT in each plant/animal using the following scale:

( 1= lowest level of DDT to 10 = highest level of DDT Note you must use all number in between 1 and 10)

3. Finally, answer the questions that followed, in check your understanding.
Organism Role in the food web (PRODUCER, PRIMARY CONSUMER, SECONDARY CONSUMER, TERTIARY CONSUMER) RATE THE LEVEL OF DDT ( 1-10) 1. What is the difference between bio-accumulation and bio-magnification?

2) Plants/animals from which of the following groups are most susceptible to problems from DDT: primary producer, primary consumer, secondary consumer or tertiary consumer. Why?

3. Why is bio-accumulation and bio-magnification bad for the food web?

4. What can we do to stop bio-magnification and bio-accumulation?