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Food Chains & Webs Review - H
7th Grade Environmental Science
Mrs. Krempa
Name __________________________________________
Date & Section __________________________________
Try and not to use your notes to complete the following review. All of this is fair game for your test!
1. Name & briefly describe the three basic energy roles in an ecosystem. For each role, give an example of an
organism that plays that role.
Producer - organism that makes its own food by photosynthesis
Example ____grass, flower, tree__________________
b. Consumer – organism that eats other organisms. Can NOT make their own food.
Example ___lion, human, dog___________________
c. Decomposer – chemically breaks down dead organisms and returns nutrients to soil.
Example ____mushroom, bacteria, maggot_________________
2. How are a food chain, food web and energy pyramid different from one another? Describe the relationship
among the three.
Relationship- all show the flow of energy
Chain – shows one path, one line of producers / consumers
Web – shows many different relationships between many different producers / consumers
Energy Pyramid – shows percentage of energy that travels up each trophic level
3. Which is better, a food chain or a diverse food web? Why?
Diverse web is better – there are more choices / options, so if one food source is gone, there are still
others to choose from.
4. What does a biomass pyramid show? What do these pyramids determine?
The living “weight” at each trophic level. Determines how diverse the next level up can be – more
weight = more food for the level above.
5. Where would you place a decomposer on a food web? Why would you place them there?
Bottom of food chain –return nutrients so producers grow, without nutrients – no producers
OR
Top of food chain – decomposers break down ALL living things on the food chain after they are dead
6. What is the synonym for producer? _____autotroph_____________________________
7. What is the synonym for consumer? _____heterotroph__________________________________
8. What do consumers control in a system? _____speed at which nutrients turn over in a system.
(Think decomposers… decomposers are consumers!)
9. What is another name for tropic level? ___ feeding level______________________
10. Define producer. List two examples.
Definition ______organism that makes its own food________________________________________
Example ______ grass _______________
Example _________ flower ______________
11. Define primary consumer. List two examples.
Definition ______consumer that directly eats a producer. Herbivore. _____________________
Example ______ moo cow____________
Example ________ rabbit_______________
12. Define secondary consumer. List two examples.
Definition _____ consumer that eats a primary consumer. Omnivore or carnivore.________________
Example _____frog, shrew, mouse______ Example ______lizard, snake_________________
13. Define tertiary consumer. List two examples.
Definition ______ consumer that eats a primary or secondary consumer. Omnivore or carnivore.
Example ____Lion______________ Example _______Hawk_________________
14. What is detritus? _____”leaf litter”, waste, plant and animal remains on the forest floor
___________________detritus = decomposer “food”______________________________
15. What is the name of the process plants use to make their own food? ____ photosynthesis ________
16. List two examples of the following consumers…
herbivore ______moo cow__________
Carnivore lions, tigers, sharks, Eagles
______deer, Parrott_______
Omnivore human, bear, shrew, mouse
________________________________
Scavenger
Coyote, goat, Robin, Blue Jay
hyena, vulture,
raccoon, crow, fox
Chicken, Duck, Goose
17. Fill in the Energy Pyramid below. Include numbers (calorie or percent), an organism at each level
and label each level as producer, primary consumer, secondary consumer or tertiary consumer.
hawk
2.967 cal
29.67 cal
296.7 cal.
2,967 calories
Tertiary Consumer
Secondary Consumer
Primary Consumer
producer
snake
grasshopper
Grass
18. Use the food web below to answer the following questions.
a. List two primary consumers from this web.
Caterpillar, Rabbit, Squirrel, Mouse
b. List two secondary consumers from this web.
Thrush, Hawk, Fox, Weasel
c. List two tertiary consumers from this web.
Hawk, Fox
d. List one organism that could be placed at more than one level in this food web. Identify what levels
they could be on.
Organism: Hawk Levels: secondary when it eats Rabbit, tertiary when it eats Thrush that
eats caterpillar then grass
Organism: Fox Levels: secondary when it eats Rabbit, tertiary when it eats mouse that
eats caterpillar then grass
There are other examples… !
e. What potential consequences are there if the mouse were removed from this food web?
Weasel would die (no food), Fox would go down (two less food sources – weasel & mouse),
Hawk would go down (1 less food source), acorn & grass would go up (mouse not eating it),
everything that eats grass and acorns would go up (more food)
f. List two pairs of organisms that may compete with each other. What would they compete for?
Pair Hawk & Fox
Compete for Rabbit, Squirrels & Mice
Pair Rabbit & Squirrel
Compete for Grass & Acorns
Thrush
Acorn
19. Draw two chains from the web above. Label each organism as producer, primary consumer,
secondary consumer or tertiary consumer.
1. Grass
Rabbit
Fox
2. Grass
Caterpillar
Thrush
Hawk
Producer
Primary
Secondary
Producer Primary
Secondary Tertiary
Consumer
Consumer
Consumer
Consumer Consumer