Phylum Nematoda: Roundworms Flashcards
How many openings does the worm have?
2
mouth and anus
Food enters at the _______ and any undigested material leave at the ______
mouth
anus
Roundworms range in size from _______ to a _______ long
microscopic
meter long
Roundworm live in diverse habitats such as:
Soil Salt Flats Aquatic sediments Polar regions Tropics Oceans Fresh water Hot springs
What do parasitic roundworms affect?
ALMOST every type of plant and animal
All roundworms have what 3 things for feeding?
- mouth
- long tube-shaped digestive tract
- anus
Most roundworms are ________ and they eat _________
Carnivores
EAT: small animals algae fungi pieces of decaying organic matter/bacteria
Parasitic roundworms may attach to what and damage what?
attach to ROOT HAIRS of green plants
Damaging the plant by removing fluid from the plant
How do roundworms breath?
oxygen diffuses across the body walls/skin
How do roundworms excrete metabolic waste?
metabolic waste diffuses across the body walls
How does the internal transport of roundworms work?
No TRUE internal transport system; rely on diffusion
Is the nervous system of roundworms simple or complex?
have SIMPLE nervous system
Roundworms have several _________ but no _______
Ganglia (nerve cells)
no true brain
Where do the nerves extend from and what foes it transmit/control?
nerves extend from ganglia and run the length of the body
transmit sensory info and control movement
What do their organs detect?
sense organs detect chemicals from prey or host
_________run the length of body
muscles
How do aquatic roundworms move?
contract muscles to move through the water (like snakes)
How do soil dwelling roundworms move?
thrash around to push their way through the soil
How do parasitic roundworms move?
burrow into the tissues of the host (ascarids)
How do roundworms reproduce?
SEXUAL reproduction only
most species of worms have separate ________ But some are _________
sexes
hermaphrodites
Where does fertilization occurs?
inside the body of the female
