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Name: ________________________________
Date: _________________________________
POWERPOINT WORKSHEET
You will need the following materials for this activity:
 pencil
 pencil crayons
 eraser
FOOD WEBS
1. What is a food web?
2. Examine the three following food webs. Count how many individual food chains make up each food web.
Use your pencil or colored pencils to help you trace the food chains.
Food Web #2
Food Web #3
Food Web #4
Copyright © May 2013 by Tangstar Science
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ANALYSING A FOOD WEB
3. Examine the food web below and answer the questions that follow. Use your pencils or colored pencils to
help you identify and mark organisms and to help you trace the pathway of food chains.
a)
How many herbivores are there? _____
g)
How many food chains are the spiders connected to? _____
b) How many omnivores are there? _____
h) How many food chains are the foxes connected to? _____
c)
How many carnivores are there? _____
i)
How many primary consumers are there? _____
d) How many top carnivores are there? _____
j)
How many secondary consumers are there? _____
e)
How many food chains are the toads connected to? _____
k)
How many tertiary consumers are there? _____
f)
How many food chains are the mice connected to? _____
l)
How many quaternary consumers are there? _____
m) Which organisms are both primary and secondary consumers? ____________________________________________
n) Which organisms are both secondary and tertiary consumers? _____________________________________________
o) Which organisms are both secondary and quaternary consumers? __________________________________________
p) Which organisms are both tertiary and quaternary consumers? ____________________________________________
q) If the plants were to go extinct explain the effect this would have on the primary consumers and the consumers above.
r)
If the rabbits were to go extinct explain the effect this would have on the foxes and squirrels.
s)
If the hawks and owls were to go extinct explain the effect this would have on the foxes, squirrels and plants.
t)
If the insectivorous bird were to go extinct explain the effect this would have on the spiders and toads.
Copyright © May 2013 by Tangstar Science