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- 1. Define sessile. Name an invertebrate with a sessile adult stage. 2. Sponges have specialized cells called collar cells. Describe how collar cells are specialized for the functions they serve. 3. What is a nematocyst? What is its function? 4. How do coral reefs form? 5. How do free-living nematodes contribute to the carbon cycle? 6. Describe the basic body plan of a mollusk. 7. What are gills? What is their function?1. What type of symmetry is seen in the roundworm? 2. Does it exhibit cephalization? 3. Ascaris is a parasite that swims constantly in human intestines. What structure protects the nematode from being digested? 4. What mammal tissue does this roundworm infect? 5. Draw a picture below of the Trichinella as viewed under the microscope. 6. Describe the movement of the vinegar eels. 7. Do they have a complete or incomplete digestive system?1. State the function of the following parts of the genus Romalea (grasshopper): antenna, tympanum, spiracles, ovipositor (female), gastric caeca, malphigian tubules, tracheae, air sacs What are the hairlike appendages called that anchor into the skin of annelids? What structures do earthworms have to help dispose of nitrogenous wastes? Briefly describe how earthworms reproduce and what structures are involved.
- 1. Describe a function for the following structures and name the phylum/class in which these structures are found. Structures Function Phylum/Class Spicules Nematocytes Notochord Tube feet Polyp Choanocytes Pharyngeal slits Amoebocytes Denticleswhen observing earthworms, while they move, can you easily distinguish the anterior from the posterior end? Yes, you can! If they are not moving, can you see any distinguishing feature in the body segments that may enable you to identify the anterior from the posterior?1a. Briefly describe the general characteristics of nematodes, trematodes, and cestodes. b. Differentiate between monoxenous and heteroxenous life cycle, and give an example of a specific parasite each. c. Briefly describe the life cycle of protozoans.
- What type of symmetry is seen in the roundworm? Does it exhibit cephalization? Ascaris is a parasite that swims constantly in human intestines. What structure protects the nematode from being digested? View the Trichinella slide. Trichinella is also a parasite. It can infect humans as well as other mammals like pigs, bears, and rodents. If untreated, it can lead to death.What mammal tissue does this roundworm infect?Draw a picture below of the Trichinella as viewed under the microscope. Although not mentioned on the website, if available view the live vinegar eel specimens. If there are no live specimens available, check out this you tube video instead: https://www.youtube.com/watch?v=UnjwvtFvyeQDescribe the movement of the vinegar eels.Do they have a complete or incomplete digestive system?36. flatworms have non-ciliated syncytial tegument true or false1. Cite 5 characteristics of sponges: 2. Which characteristics are unique to ctenophores? 3. Cnidarians are diploblastic, possessing an ectoderm and endoderm. Name the gelatinous nonliving material found between these two tissues. What cells are found within this gelatinous tissue? List the functions of these cells. 4. Polyp body consists of a tubular sessile body. True or false? 5. Define radial and bilateral symmetry, and protostomes and deuterostomes: 6. The presence of two different body forms, or dimorphism, is seen in the phylum Cnidaria. The form resembles an "upside-down cup" with tentacles, and the body form consists of a tubular sessile body. Hydra is an example of the body form, and a jellyfish is an example of the pody form.
- A) State the function of the following external parts of the genus Cambarus (Class Crustacea): walking legs: opening of sperm duct: gills: excretory pore: abdomen: eyes What are the hairlike appendages called that anchor into the skin of annelids? What structures do earthworms have to help dispose of nitrogenous wastes? Briefly describe how earthworms reproduce and what structures are involved.1. While the earthworms are not moving, can you see any distinguishing feature in the body segments that may enable to identify the anterior from the posterior?Explain pore canals in cockroaches.