topic 9 - ecosystems (parasitism and mutualism)

Question 1

host

Answer 1

an individual that can be infected by a certain pathogen

Question 2

mutualism

Answer 2

a relationship between individuals of different species where both individuals benefit, e.g. by getting more food or shelter than if they were on their own

Question 3

parasite

Answer 3

an organism that lives on or in a host organism and takes food from it while it is alive

Question 4

parasitism

Answer 4

a feeding relationship in which a parasite benefits and its host is harmed

Question 5

nitrogen-fixing bacteria

Answer 5

nitrogen-fixing bacteria live inside root nodules on the roots of leguminous plants such as peas, beans and clover

Question 6

hooks and suckers

Answer 6

used to attach it to the intestine wall. it has no use for the eyes so it doesn’t have any

Question 7

flat body

Answer 7

large SA for food absorption

Question 8

each section contains…

Answer 8

male and female reproductive organs so the worm can self-fertilise its egg if other tapeworms are not nearby