Platyhelminthes Flashcards
1
Q
how do they reproduce
A
asexually and sexually
2
Q
what species belong to this group?
A
flat worms, flukes and tape worms
3
Q
are they diploblastic or triploblastic
A
triploblastic so they have three germ layers
4
Q
they are acoelomates what does this mean
A
they have no body cavity
5
Q
how does gas exchange happen in them?
A
direct diffusion
6
Q
what is the nutrition and digestion like in playhelminthes
A
- gastrovascular cavity: simple or branched
- proteolytic enzymes for extracellular digestion
-cells phagocytose small food for intercellular digestion
-sac like gut so undigested food is excreted through the mouth
-no circulatory system
-some capture pray in slime
7
Q
what is the locomotion like
A
body covered in cilia which provide force for propulsion
8
Q
how does asexual reproduction occur
A
via fission
9
Q
what is the nervous system like
A
nerve chords with a simple brain and they show photosensitive behaviour
