Relationships Between Organisms

Question 1

Predation

Answer 1

One thing eats another; +, x=one good, one dead

Question 2

Defenses against predation

Answer 2

Cryptic coloration (camouflage), warning coloration (I’m poisonous!)

Question 3

Competition

Answer 3

Two things fighting for resources, mates, etc. >,< May or may not be bad or good for organisms. May be interspecies, but not always.

Question 4

Symbiosis

Answer 4

Organisms living together in close association.

Question 5

What are the three types of symbiosis?

Answer 5

Parasitism, mutualism, commensalism.

Question 6

Parasitism

Answer 6

Host and parasite, +, - =Good for parasite, not host.

Question 7

Ex. of parasites?

Answer 7

Mosquito, flatworms, nematodes, mistletoe

Question 8

Commensalism

Answer 8

One partner benefits without significantly affecting the other. +,< = One good, one neutral. Can quickly become parasitism.

Question 9

Is commensalism common?

Answer 9

No, it is rare. There are few examples of this in nature because organisms are almost always affected in a relationship.

Question 10

An example of commensalism?

Answer 10

Moths drinking cow tears, cattle egret living on oxen, clownfish living in anemone, barnacles living on a whale.

Question 11

Mutualism

Answer 11

Both benefit: +,+ =Both good. Many examples in nature of mutualism.

Question 12

Example of mutualism?

Answer 12

Oxpecker and rhino, ants and acacia.