Poriferans & Cnidarians
What symmetries can poriferans and cnidarias have?
Both can have radial symmetry but sponges can also be asymmetrical.
They have cylindrical body and can be parasites.
Nematodes
Most molluscs have a visceral mass protected by a protective covering called ..........
Shell
Which kind of symmetry do echinoderms have?
Radial
Tell the classes of arthropods.
Myriapods, arachnids, crustaceans and insects
In their gastrovascular cavity.
Platyhelmintes have an enlongated and.......... body.
Flat
Which class of molluscs have a spiral-shaped shell and crawl over their stomach?
Gastropods
Say four examples of echinoderms.
Brittle stars, sea lilies, sea urchins, starfish or sea cucumbers.
Arthropods can be found in water. True or false?
True
Name of the cells with flagella, located in the atrium, that porifers use to create a current so that water flows in the same direction.
Choanocytes
Say three examples of worms
Planarians, tapewors, anisakis, trichinella, roundworms, earthworms, leeches...
Molluscs have a soft, non segmented body divided into three parts:
Head, foot and visceral mass
To maintain their shape and protect the body, they have a skeleton outside the body made of rigid plates. True or false?
False
Name the classes of arthropods that divide their bodies in cephalothorax and abdomen.
Arachnids and crustaceans.
Poriferans have no tissues but, do they have specialised cells?
Yes
All worms move by..........
Crawling
Bivalves have a blade-shaped foot for digging and their shell separated into ...................
Two valves
The name of the hydraulic system echinoderms use for movement, circulation...
Ambulacral system
The process through which larvae transform into an adult shape is....
Metamorphosis
Cnidocytes are useful to:
Attack and capture preys
Annelids have a body divided into segments called.....
Cephalopods have a highly developed head and a foot made up of tentacles with
suckers
Types of reproduction carried by echinoderms
Sexual and asexual reproduction