Surf into Science 3:	Human Food Webs					


The student will be able to:

·  describe food webs involving humans.

·  understand that a food web is made up of many food chains that are linked

  
Activity:

1.  Set up a bulletin board display entitled "Food Webs for Humans".  Position 
    a circle representing the Sun to the side.  


2. Write the following names of organisms on separate small index cards:

   Grass	Moose		Human		Corn		Chicken

   Duck		Hay		Grasshopper	Cow		Trout

   Shark	Seal		Water Plants	Twigs		Rabbit

   Berries	Bear		Salmon		Carrot		Mosquito

   Worm		Pig		Codfish 	Sheep		Deer


3. Give each student an index card.


4. Inform the students that they have to listen to the instructions that you 
   are going to give them.  Tell them that at some point they will use thumb 
   tacks to attach their index cards to the bulletin board, draw arrows to 
   certain locations, and return to their seats.
     

5. Directions for the students:

    1. The Sun provides energy for the plants.  If your organism is a type of 
       plant, attach the index card to the bulletin board, draw arrows from 
       the Sun to your plant, and return to your seat.
    
    2. If your organism eats plants, attach your index card to the bulletin 
       board, draw an arrow from the plant to your organism, and return to 
       your seat.
 
    3. If your organism eats any of those already in the display, attach your 
       index card to the display and draw arrows from the others to your 
       organism and return to your seat.
 

6. Continue with this procedure until all students have attached their index 
   cards and then have a discussion about the completed food web to see that 
   they understand the food chain sequences.

   
Assessment:

·  Observe the students' ability to listen to the instructions and complete 
   the task.