3.5 symbiosis

Question 1

symbiosis

Answer 1

an intimate relationship that has co-evolved between members of two different species

Question 2

parasitism

Answer 2

a parasite benefitting in terms of energy or nutrients where as-its host is harmed by the loss of these resources

Question 3

parasite has a limited metabolism which means

Answer 3

many parasites cannot survive if they lose contact with their host

Question 4

why do parasites not cause there host to die

Answer 4

death of host causes death of the parasite

Question 5

direct contact

Answer 5

parasite is passed person to person by physical contact
head lice

Question 6

release of resistance stages

Answer 6

parasite survives in adverse conditions for a long period of time until they com into contact with a new host
cat fleas have resistant larvae and pupae

Question 7

use of a vector

Answer 7

a vector is an organism that does not cause disease itself but which spreads infection by transferring pathogens from one host to another
plasmodium

Question 8

direct life cycle

Answer 8

some parasite lifecycles are simple and only involve one host
head lice

Question 9

indirect lifecycle defintion

Answer 9

others involve intermediate hosts to allow them to complete their lifecycle

Question 10

indirect lifecycle summary

Answer 10

more highly evolved then parasites
use a primary host for sexual stage of reproduction
also uses a secondary host
new primary host becomes infected when it consumes the secondary host

Question 11

advantages of multiple hosts

Answer 11

increases reproductive capacity
increase chance of survival

Question 12

mutualism

Answer 12

both mutualistic partner species benefit in an interdependent relationship or one species benefits but the other isn’t harmed

Question 13

clown fish anemones mutualistic relationship

Answer 13

anemone sting provide the fish with protection from predators
the fish defend the anemones from the butterflyfish that eat them. also absorb food scraps from the fish.