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1. the largest and most diverse group of animals on Earth
A
vertebrates
B
invertebrates
C
plants
2. a jellyfish is an example of a...
A
porifera
B
platyhelminth
C
cnidarian
3. a butterfly is an example of a...
A
arthropod
B
echinoderm
C
annelid
4. which invertebrate group has a body divided into rings?
A
annelids
B
molluscs
C
arthropods
5. which invertebrate group doesn't have heads?
A
molluscs
B
nematodes
C
echinoderms
6. the simplest invertebrates are porifera and cnidaria. They have...
A
no organs
B
stinging cells
C
rigid exoskeletons
7. Porifera are FILTER FEEDERS, which means water enters through a __________, deposits nutrients, then leaves through the ____________.
A
spicules / fibres
B
central cavity / osculum
C
polyp / medusa
8. a porifera's body is full of ______________, so water circulates in and out of them
A
spikes
B
pores
C
fibres
9. the internal skeleton of porifera can be made of spicules, fibres, or....
A
tentacles
B
pores
C
a combination of spicules AND fibres
10. Porifera have...
A
no symmetry
B
linear symmetry
C
radial symmetry
11. cnidarians have...
A
no symmetry
B
linear symmetry
C
radial symmetry
12. cnidoblasts, which give cnidarians their name, are...
A
gastrovascular cavities
B
tentacles
C
stinging cells
13. the stinging cells of cnidaria are located...
A
on the tentacles
B
in the gastrovascular cavity
C
on the polyp
14. this is both the mouth and the anus of cnidaria
A
tentacles
B
gastrovascular cavity
C
15. true or false: cnidarians are carnivorous
A
true
B
false: they are filter feeders
C
false: they are omnivorous