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6. was the mouth on the upper side or the lower side of the echinoid
7. what is the entire echinoid skeleton called?
- plastron
- test
- echinoidea
- apical system
8. what is the centre of the aboral surface called?
- the apical system
- the water vasular system
- the perignathic girdle
9. where did the tube foot protrude from in a regular echinoid?
- periproct
- pore pairs
- madreporite
- tubercle
10. what does the water vascular system do?
- help to extend the echinoids tube feet
- the main source of respiration for the animal
- how the animal breathes - like gills on a fish
11. were echinoids able to move?
- yes
- no
- only regular
- only irregular
12. where were the sperm and eggs released on an echinoid
- genital plate
- pubic bone
- madreporite
- aristoles lantern
13. what feature of the irregular echinoid prevented sediment moving into the mouth
- peristome
- labrum
- periproct
- plastron
14. what type of symmetry do all echinoids show?
- five-fold symmetry
- bilateral symmetry
- radial symmetry
15. which plates were where the tubercles were located? for regular echinoids
- interambulacral plates
- ambulacral plats
16. what was the name of the plate where the pore pairs are located on an irregular echinoid?
- petaloid ambulacral plate
- interambulacral plate
- ambulacral plate
17. do regular echinoids live in high energy or low energy environments?
18. what is the echinoid phylum?
- cephlapoda
- cnidaria
- echinodermata
- mollusca
19. what are the jaws on a regular echinoid called?
- aristoles lantern
- periproct
- plastron
- labrum
20. how does the regular echinoid feed?
- are filter feeders
- uses jaws to graze
- uses cilia to generate currents