2.4 parasitic nutrition Flashcards
1
Q
what are parasites
A
organisms which live on/in another organism, (the host)
2
Q
why do parasites cause harm
A
- obtain nourishment at the expense of the host
can cause death
3
Q
why is the study of parasites economically relevant
A
- parasites = cause disease in humans, crops and domestic animals
4
Q
what problems do the pork tapeworm have to overcome
A
- digestive juices
- peristalsis
- extreme pH
- hosts immune system
5
Q
in order to survive, a tapeworm must….
A
- have a way of attaching/penetrating the host
- protect against immune system of a host
- produce many eggs
6
Q
adaptations of a tapeworm
A
- curved hooks (attaching to gut wall)
- body covering (protects against immune system)
- large surface area to volume ratio (food absorbed over entire body)
- eggs have resistant shells (survive until eaten by secondary host)
7
Q
what is an ectoparasite
A
lives on the host
8
Q
what is an endoparasite
A
lives within the host
