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List the advantages and disadvantages of each sponge body plan:
1. Asconoid
2. Syconoid
3. Leuconoid
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- Differentiate the three different body plans in sponges: Characteristics Asconoid Syconoid Leuconoid 1. Wall 2. Mesenchyme 3. Choanocytes 4. SpongocoelA. Describe the general characteristics of Poriferans as to: Description of Poriferan characteristics 1. habitat 2. symmetry 3. integumentary features 4. nutrition 5. spicules B. Differentiate the three types of canals systems of sponge as to structure, efficacy, and importance.Which of the following is not true of Acanthostega? It was aquatic It had gills It had four limbs It laid shelled eggs.
- Define the following terms that relate to the sponges: Spongocoel: Osculum: Choanocytes: Amoebocytes: Spicules: Sessile: Hermaphroditic: Flagellated larva:1)What is the best synapomorphy for Phylum Mollusca? 2) What is a synanthropic arthropod? Provide an example. Please answer asap and in short and content should not be palgarised please1. What are the criteria that delimit phylum Echinodermata to its classes? 2. What are the functions of the tube feet, madreporite, and ambulacral groove? 3. Give the economic importance of echinoderms. 4. What is regeneration?
- Define the following with respect to gastropods: operculum, torsion, fouling, bilateral asymmetry, rhinophore, pneumostomeThese differ from the other classes of sponges in that their cells are syncytial (multinucleate and only a few cells or even one cell can cover the entire skeleton) Hexactinellida Calcerea Demospongia HomescleromorphaMatch the following groups under Phylum annelida to the following characters: Match each item to a choice: Branchiobdellida Hirudenea Acanthobdellida Oligochaeta Polychaeta Choices: : Loss of remaining setae; 34 metameres : Anterior body sucker; 15 metameres : Presence of clitellum; but without superficial annuli E Posterior body sucker; 30 metameres : Parapodia; complex head
- Most sponge species are of leuconoid construction, is this an advantage or disadvantage?1. What type of symmetry is displayed in the sponge specimens? 2. What is the function of spicules? 3. Do sponges contain true tissues? 4. Can you find any collar cells in the slide? 5. What is the function of the collar cells? 6. Can you find any epidermal cells in the sponge slide? 7. What is the function of the epidermal cells?Define each of the following with reference to cestodes: scolex, microtriches, proglottids, strobila.