Monday, October 22, 2012

The Niche Worksheet

1. What is a niche?
Describes what an organism does and how it interacts with the biotic and abiotic factors of its environment. The range of physical and biological conditions in which a species lives and the way the species obtains what it needs to survive and reproduce. 

2. Give an example of resources a squirrel might need.
A squirrel might need acorns for food, space (trees which they live in and climb) and soil to bury acorns during the winter.

3. Three different warbler species live in the same tree. One species feeds at the top of the tree, the second species feeds in the middle part of the tree, and the third species feeds at the bottom of the tree. Do all three species occupy the same niche? Explain.
No, each species occupies a different niche within the same tree. They each eat different things in the same place. If they were to stay at the exact same time then problems would emerge and result in one organism to over power the other.


True 4. Competition occurs when organisms attempt to use the same resources.

False 5. competition between members of the same species is known as interspecific (intraspecific) competition.

False 6. The competitive exclusion principle states that no two organisms(species) can occupy exactly the same niche in exactly the same habitat at exactly the same time.

True 7. If two species of bacteria are grown in the same culture, one species will always outcompete the other.

True 8. Members of the same species tend to divide resources instead of competing over them.

Predation, Herbivory, and Keystone Species   

C 9. A lion eating a zebra is an example of
               A. herbivory
               B. habitat destruction
               C. predation
               D. a keystone species

A 10. A cow eating grass is an example of
               A. herbivory
               B. predation
               C. habitat destruction
               D. a keystone species

D 11. A keystone species is one that
               A. eats a mixture of plants and animals
               B. is introduced into a community after a major disturbance
               C. causes the amount of diversity in a community to decrease
               D. helps to stabilize the populations of other species in the community

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