! ! ! ! Short Answer Phylum/Class Mollusk More Phylum/ Class Mollusk Hard Questions

Gastropods secrete shell from?

Mantle

Scrapes food like a file

Radula

Internal structures which function in exchanging O 2 and CO 2

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.