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Short Answer Phylum/Class Mollusk More Phylum/ Class Mollusk Hard Questions 100 100 100 100 200 200 200 200 300 300 300 300 400 400 400 400 500! 500! 500! 500! 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.