Download WHO EATS WHOM

Name: ____________________________________
Period: ________
Date: _______
WHO EATS WHOM?
Part 1: Vocabulary – Fill in the blanks with the terms below.
abiotic factors
biotic factors
consumers
decomposers
ecology
food chain
solar
food web
producers
trophic level
1. ____________________
All living factors in an ecosystem (plants, animals, etc.)
2. ____________________
All nonliving factors such as climate and temperature
3. ____________________
The study of how organisms interact with each other and the environment.
4. ____________________
Heterotrophic organisms that must consume other organisms for energy
5. ____________________
Describes plants because they make food from sunlight.
6. ____________________
Source of energy for most ecosystems on Earth.
7. ____________________
Organisms that obtain energy from the remains of other organisms.
8. ____________________
Feeding relationships between individual organisms
9. ____________________
Each step in a food chain or web that shows the feeding relationship between organisms
10. ____________________
Mass of interconnecting food chains
Part 2: Food Chains and Food Webs
11.
12.
13.
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15.
16.
17.
What is the initial (ultimate energy source of this ecosystem? ______________________________________________
List all of the producers. __________________________________________________________________________
List all of the primary consumers. ___________________________________________________________________
List all of the secondary consumers. ________________________________________________________________
List 1 food chain above that has 3 links. ______________________________________________________________
List 1 food chain above that has 4 links. ______________________________________________________________
Describe how 3 organisms would be affected if all of the mice were removed from the food web.
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18. Describe how the rabbit population would be affected if the mountain lions were removed from the food web.
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Part 3: Ecological Pyramids:
19. Which trophic level contains autotrophic organisms? _____________
20. Which trophic level contains herbivores? __________________
21. Which trophic level contains carnivores and/or omnivores? _______
Level 3
22. Which trophic level contains the most available energy? ___________
Level 2
23. Which trophic level contains the least available energy? ___________
Level 1
ORGANISM
Young human
cow
Alfalfa plant
NUMBERS
1
4
20 million
MASS
50 kg
1,000 kg
8,000 kg
AVAILABLE ENERGY
.06%
7.00%
100%
Fill in the pyramids using the information in the chart above, so that the three organisms are placed in their correct
levels. Then, answer the questions that follow.
24. What is the source of energy for all of the ecological pyramids? ________________________________________
25. In general, what kind of organism makes up the base of any ecological pyramid? ___________________________
26. How is the energy loss from one trophic level to the next reflected in the pyramid of numbers? _________________
27. ____________________________________________________________________________________________
28. Suppose an ecosystem has a greater number of individual herbivores than individual producers. How would this affect
the shape of the ecosystem’s pyramid of numbers? ______________________________________________
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29. In the pyramid of energy, why do different trophic levels have different amounts of energy available? ____________
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