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 CH 6 MODEL ANSWERS G 6

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Mr_Abdulrahman

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Posts : 42
Join date : 2010-01-28

PostSubject: CH 6 MODEL ANSWERS G 6   Sat Feb 13, 2010 7:53 am



1) Complete the following sentences :

1. When organisms fight for surviving in a habitat with limited resources , this is called competition

2. Animals my compete for food, water and shelter

3. For an animal to survive in its habitat, it must be adapted

4. plants may compete for water , air , sunlight and living space

5. The number of predators and preys keep increase and decrease until they are balanced again in their ecosystem

6.symbiosis is a close, long-term relationship between organisms

7.parasite is the organism that benefits in that relationship, but host is harmed

8.commensalisms is symbiosis that helps one organism, but the other is not affected

9. When two organisms benefit from their relationship, this is called mutualism

10.E. coli bacteria live in the human body's small intestine

2) Rewrite the following sentences in the right way:

1) Organisms with different needs compete more.

……………………………………………the same………………………………………………………………..

2) Competition may happen for organisms of the same species ,not from different species

…………………or………………………………………………………………………………………………………

3) predators often have eyes on the side of its head

…………………preys…………………………………………………………………………………………………

4) The fungus is a host for weevil beetle

………………………………………… parasite on ………………………………………………………….

[b]1)
Symbiosis is a temporary relationship between organisms

………………………………………continuous…………………………………………………



3) give the scientific reason for each of the following:

1) it is a bad idea for a parasite to kill its host

Because it depends on its host for its needs

2) zebras and wildebeests live together with little competition

Because zebras eat tall grasses, exposing the short grasses preferred by wildbeests

3) athlete's foot is an example of parasitism



[size=12]Because it is a parasitism relationship in which fungus benefits but
the host is harmed

[/size]




4) complete the following graphic organizer:



http://www10.0zz0.com/2010/02/12/23/887105688.jpeg



5) Tell the relationship between each pair of the following:

1) Owls and rabbits

Owls are predator and rabbits are preys

2) Mites and human body

mutualism

3) Fleas or ticks and human body

parasitism

4) Horses and tapeworms

parasitism

6) What are organisms you know have the following adaptations:

1) Camouflages a plant ,sick ,or rock

2) Spikes sea urchins

3) Bad-tasting ,poisonous chemicals poison dart frog

4) Protective coloration tapir



[/b]
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