Annelids
What are two examples of annelids?
earthworms and leeches
Do tapeworms have a mouth?
No. They absorb nutreints from the host´s intestines directly through their skin.
Give two examples of bivalves.
mussles, clams, oysters, etc.
Give two examples of gastropods.
snails, slugs
Give two examples of cephalopods.
octopus, squid, cuttlefish
Do annelids have a brain?
Yes, though it is small and not complex.
What is the definition of a host?
An animal or plant that a parasite lives in or on.
How do all aquatic molluscs breathe?
They have gills.
What do gastropods eat?
They´re generally herbivores.
What does cephalopod mean?
Head-foot
ceph = head
pod = foot
What do annelids eat?
They have a varied diet. They eat animal and plant remains, plankton and the blood of vertebrates for parasitic worms.
How do nematodes reproduce?
Sexually. Females lay eggs inside the host and other animals ingest them, which continues the cycle.
True or false: bivalves don't respond to light because they don't have eyes.
Do gastropods have tentacle?
Yes! They have 4 tentacles on their head that help them to smell.
What is a siphon?
It is a long tube-like structure used to expel water and propel the cephalopod. It is used for movement.
What are setae?
Hairs on the skin that help them move.
Describe planarian reproduction?
They can reproduce sexually or asexually.
Sexual planarian species are hermaphrodites.
Asexual freshwater planarians rip themselves in half and each piece regenerates into a new organism. This is called binary fission.
How do bivalves move?
They have a muscular foot which they use to dig in the seabed where they live.
Where do gastropods live?
Most are aquatic, though many live on land.
Corect the sentence: Some cephalopods have an external shell.
Some cephalapods have an internal shell.
Or
Cephalapods don´t have external shells.
What are metameres?
Metamers are the name of the segments that make up the body of annelids.
What is cephalisation of the nervous system?
Cephalisation: ceph = head.
We can distinguish the front part, or head, from the posterior part of the organism.
What is a radula? Do bivalves have a radula?
A radula is like a tongue covered in rows of hardened teeth.
All molluscs have a radula, except bivalves!
Bivalves use cillia to move their food.
How do gastropods move around?
They have a muscular foot that secretes a viscous substance that helps them move.
Explain cephalopod nutrition:
What do they eat?
What structures do they have to help them eat?
Cephalopods are carnivores. They have structures in the mouth called a beak and a radula.