Biology Lab 1106 Baylor University Exam 3 QUESTIONS AND VERIFIED ANSWERS 2023.

Biology Lab 1106 Baylor University Exam 3 QUESTIONS AND VERIFIED ANSWERS 2023. 1. Phylum Porifera (sponges): asymmetrical lack true tissues have unique cells called CHOANOCYTES (flagellated cells that will draw in water and filter food particles) Genus: Grantia, Spongia, Euplectella 2. Phylum Porifera Genus Grantia: isolated spicules walls of sponges contain amoebocytes and crystallized structures called spicules incurrent canals and flagellated canals 3. Phylum Porifera Genus Spongia: have spongin fibers that are more flexible live specimen 4. Phylum Porifera Genus Euplectella: live specimen of Porifera 5. Phylum Cnidaria: radial symmetry true tissues 2 germ layers (Endoderm and ectoderm) have stinging cells (cnidocytes) involved in predation polymorphic Classes: Hydrozoa, Scyphozoa, Anthozoa 6. Polymorphic: alternate between polyp and medusa stage classes are characterized by which morph is dominant 7. Common Life Cycle of Cnidaria: 1. Medusa produce and release eggs and sperm into water for fertilization (some retain eggs) 2. Zygote develops into a swimming mass of ciliated cells called the planula larva 3. Planula will settle to a substrate and develop into a polyp 4. Polyp may reproduce asexually by budding other polyps or continue the sexual cycle by budding immature medusae called ephyrae 5. Ephyrae develop into mature medusa 8. Class Hydrozoa: polyp morph dominates Genus: Hydra, Obelia, Ph