Flatworms
What type of body structure do flatworms have?
They are acoelomates with bilateral symmetry.
How do earthworms move?
Muscle contraction and hydrostatic skeleton
What type of body cavity do roundworms have?
Pseudocoelom
What type of body cavity do segmented worms have?
Coelom
How do parasitic flatworms obtain nutrients?
Through direct absorption from the host's body.
What structure grinds food in earthworms?
Gizzard
How do roundworms exchange gases and excrete waste?
Diffusion
What type of circulatory system do most segmented worms have?
Closed circulatory system
How do flatworms reproduce asexually?
By regeneration
How do earthworms contribute to soil health?
They aerate and add nutrients to the soil.
What type of skeleton do roundworms have?
Hydrostatic Skeleton
What are setae in segmented worms?
Bristles that help in movement
What is the nervous system structure found in flatworms?
Two nerve cords with ganglia
What is the clitellum in earthworms used for?
Producing a cocoon for reproduction
How do roundworms move?
By thrashing side to side
What is the function of the nephridia in segmented worms?
Excretion of metabolic waste
What is the primary function of flame cells in flatworms?
To excrete waste
Give one internal structure and its function.
Answer varies
How do roundworm larvae typically develop in parasitic species?
By migrating through different parts of the host body
What type of 'heart' do they have?
aortic arches