Short Answer
Phylum/Class
Mollusk
More Phylum/
Class Mollusk
Hard Questions
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Gastropods secrete shell from?
Mantle
Scrapes food like a file
Radula
Internal structures which function in
exchanging O2 and CO2
Gills
Siliceous supporting structure
found in some Porifera.
Spicules
Advanced development of head and
nervous system
cephalization
as in cephalopods
A sea urchin body is called a test.
Echinoderm
This organism has no true tissue or
symmetry.
Porifera
Sponges
Nudibranchs are aggressive
carnivores.
Gastropod
Jet propulsion with excurrent siphon
cephalopods
Segmented body and two
sets of antennae.
arthropods
Pearls come from this group.
Bivalves
Some live as polyps, some as
medusa, some both at stages of their
lives.
Cnidaria
Pentamerous – in love with 5 others.
Echinoderm
Nematocysts are stinging cells.
Cnidarian
Pedicellariae prevent organisms
from growing on their body.
Echinoderm
Structures on cephalopods that help
them camouflage or communicate.
chromatophore
Secrete byssal thread that attach
them to rocks and other surfaces.
Bivalve
Mussels
Explain difference between cross
and self fertilization.
cross – a different organism of same
species
self – own egg and sperm
Guts are protruded out to distract
predators.
Evisceration
Describe how sponges get their
food.
The choanocytes create current and draw
water in through pores food is caught by
collar cells then water goes out osculum.