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- 3 (8.B) A student collected the animal shown below on a field trip. The student used a dichotomous key and a microscope to classify the animal. Step Characteristic Identification Go to 2 la Possesses segmentation 1b Lacks segmentation 2a Has an exoskeleton with jointed appendages Has no exoskeleton, unjointed appendages (if any present), and a segmented worm- Go to 3 Phylum Arthropoda 2b Phylum Annelida like body; is possibly in a tube (if in a tube, may have tentacles) Possesses a foot, a radula, arms, and/or За a shell Phylum Mollusca Lacks all of the above and is dorsoventrally 3b Phylum Platyhelminthes flattened How should this animal be classified? A Arthropoda C Mollusca B Annelida D Platyhelminthes silominA istockphoto.com/Nancy NehringFor phylum Echinoderms and class Crinoidea 1. Characteristics. List whether the organism is:a. Diploblastic or triploblastic (if applicable) b. Deuterostome or protostome (if applicable) c. Coelomate, pseudocoelomate or eucoelomate 2. Organ/system characteristics. Answer the following for each organism:a. How is their circulatory system? b. Excretory/osmoregulation: How does the organism eliminate waste? What organs do they use?c. Skeleton/support: List the structures or ways this organism supports itself. 3. Ecology. Describe/answer the following for each organism:a. Does it have a complete or incomplete digestive system? How does this animal feed?b. Identify any unique feeding structure• Be sure to use the correct terms to identify any unique feeding structure(s) used by theanimal.Page < 3 of 7 4. Using forceps or tweezers, gently pull the 4th or 5th pereiopod to examine its motion. Do so without tearing the appendage off from the body. How would you describe its maneuverability? What are the limitations to motion of these walking legs? Given their small size and limited capacity for muscle attachment, how is it that this animal can use these appendages for motion? 5. Describe the structural differences between the pleopods and the pereiopods up the prawn. What hypothesis can you make regarding the functional use of pleopods by comparison? Pleopods of prawns are far larger in comparison to body size then crayfish (see drawings below). What might this tell you about their use between the two closely related animals? 6. Compare the overall body plan of the prawn to that of an insect like a grasshopper (see drawings below). Provide a complete side-by-side analysis of the two groups that would include body regions, and appendages. Focus your comparison on how the…
- All arthropods 1. Undergo complete metamorphosis 2. Have jointed appendages 3. Molt 4. Have segmented bodies 5. Have an exoskeleton (1,2 and 4/ 3 and 5/ 2,3,4 and 5/ 1,4 and 5)?3. The chelipeds of prawns are quite diminished in size when compared to crayfish and lobster. Hypothesize why you think these differences exist? Find some support for your hypothesis from the Internet or other scientific resource. 4. Using forceps or tweezers, gently pull the 4th or 5th pereiopod to examine its motion. Do so without tearing the appendage off from the body. How would you describe its maneuverability? What are the limitations to motion of these walking legs? Given their small size and limited capacity for muscle attachment, how is it that this animal can use these appendages for motion? 5. Describe the structural differences between the pleopods and the pereiopods up the prawn. What hypothesis can you make regarding the functional use of pleopods by comparison? Pleopods of prawns are far larger in comparison to body size then crayfish (see drawings below). What might this tell you about their use between the two closely related animals? 6. Compare the overall body plan…For phylum Chordata and Class Reptilia (turtles ) 1. Characteristics. List whether the organism is:a. Diploblastic or triploblastic (if applicable) b. Deuterostome or protostome (if applicable) c. Coelomate, pseudocoelomate or eucoelomate (if applicable) 2. Organ/system characteristics. Answer the following for each organism:a. How is their circulatory system? b. Excretory/osmoregulation: How does the organism eliminate waste? What organs do they use?c. Skeleton/support: List the structures or ways this organism supports itself. 3. Ecology. Describe/answer the following for each organism:a. Does it have a complete or incomplete digestive system? How does this animal feed?b. Identify any unique feeding structure• Be sure to use the correct terms to identify any unique feeding structure(s) used by theanimal.
- 1) Develop a hypothesis that explains the origin of sponge skeletons (i.e, why did sponges develop skeletons in the first place). Keep the following in mind: the current paradigm suggests that sponges were the first animals, there were NO predators when sponges evolved, and that available food was floating in the water.15. On the tree below, mark the place or places that three tissue layers have evolved in animals. Tissue Lineage Layers Porifera N/A Cnidaria 2. Platyhelminthes 3. Rotifera 3. Annelida 3. Mollusca Nematoda 3 Arthropoda Echinodermata 3. Chordata Is the possession of three tissue layers homologous or convergent among animals?part i Animal phylogenies based on molecular and morphological characters can be different in regards to the placement of the phylum Platyhelminthes. What is the best explanation for this?choose 1 a. The Platyhelminthes clade separated from other clades before coeloms evolved and consequently Platyhelminthes have never had a coelom. b. Some Platyhelminthes have a coelom, but others do not and it is difficult to conclude anything about its evolution within the clade. c. Platyhelminthes originated from ancestors with a coelom and have retained it to the present time. d. Modern Platyhelminthes do not have a coelom but did originate from an ancestor that had one. e. Platyhelminthes evolved from an ancestor without a coelom but developed one during the course of their evolution. part ii If current molecular phylogenies of land plants are correct and to be believed they suggest that. Choose 1 a. the Zygnematales and land plants adapted to the same environmental…
- 1.Explain how crocodilian morphology makes it an ideal ambush hunter. 2.The Order Squamata consists of 3 sub orders.Why are these suborders so different-give at least 2 distinctive characteristics of each. 3.How do reptile eggs differ from amphibian eggs?why is it important?1. Both Lepidoptera and Diptera have proboscis. true/false. 2. Phthirapterans have large claws that allow them to grab hairs of mammals and birds. true/false 3. Coronal and frontal sutures can be split when molting. true/false 4. Collembola has a pair of furcula. true/false1. Compare and contrast an Acanthocephalan and a Rotifer by providing 5 points of comparison. Point of comparison Rotifer Acanthocephalan 1. 2. 3. 4. 5. 2. What structures are found in Acanthocephalans which allows them to perform its endoparasitic life? Explain
