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- Flatworms (phylum platyhelminthes) Procedure 1. Observe the live planaria, if present, under the dissecting. If there are no live specimens, view this video: https://www.youtube.com/watch?v=w0QzSYQGsnA a. What type of symmetry does the planaria display? b. Does the planaria exhibit cephalization? c. Can you locate the planaria eyespots? What do the eyespots sense? 2. View the large planaria model. Make sure you can identify the pharynx, the eyespots, and the flame cells. a. Does the planaria have a complete or incomplete digestive system? b. What is the function of the flame cell? c. Are planaria hermaphrodites? d. Scientists say planaria have ladder like organs. Why?Clam I need help with the following questions about Clam When dissecting a clam, what functions of the parts are observed? What is the general feeding strategy of the clam, and how does the digestive system allow it to behave in that way? What is the nature of the circulatory system (open or closed) and is the clam acoelomate, pseudocoelomate, or true coelomate? How does the clam reproduce, obtain oxygen, and get rid of waste?Siphonicle neck in ammonoidea is directed forwads Select one : True False
- How does segmentation enhance annelid locomotion? Segmentation creates repeating body structures so the entire organism functions in synchrony Segmentation allows specialization of different body regions Neural segmentation allows annelids to localize sensations Muscle contractions can be localized to specific regions of the body to coordinate movement.Most sponge body plans are slight variations on a simple tube-within-a-tube design. Which of the following is a key limitation of sponge body plans? Sponges lack the specialized cell types needed to produce more complex body plans The reliance on osmosis/diffusion requires a design that maximizes the surface area to volume ratio of the sponge Choanocytes must be protected from the hostile exterior environment Spongin cannot support heavy bodies.Match each structure with its descriptions. _____ radula a. internal skeleton _____ exoskeleton b. external skeleton _____ endoskeleton c. stinging cell of cnidarians _____ cnidocyte d. excretory organ of insects _____ compound eye e. mollusk feeding device _____ tube foot f. larva of annelid or mollusk _____ trochophore g. has many lenses _____ Malpighian tubule h. moves an echinoderm _____ gastrovascular cavity i. digests a planarians food
- Mature Medusa 1. Look at the life cycle diagram of a jellyfish species on the right. Immature Medusa a) Indicate which type of reproduction (asexual or sexual) takes place at each of the four stages indicated on the diagram. Explain how you can tell. Fertilised Egg 4 1 Blastula b) What are the advantages of having Medusa Planula - Bud Larva both asexual and sexual reproductive capabilities? c) Under which circumstances do many organisms, such as rotifers and single-celled plankton, switch from asexual to sexual 3 Colony Polyp Bud Polyp reproduction? Why? Frustule Bud Frustule LarvaLabel the structures: Scolex, immature segment, mature segment, gravid segment, ova, cysticercus specie: Taenia solium attach labeled image. thank youpict Experimental Planaria #1 Cut in half into front (anterior) and rear (posterior) Day 1 Measuring the Planaria This operation is best performed by removing some of the water from the dish into the lid with a clean pipette and waiting for the worm to stretch out. Measure the length of the worm in millimeters. (Always replace the water right away, you can use the dish lid to transfer water to and from the planarian environment.) A. Record the length of the front (anterior) section just AFTER you cut. This is your INITIAL front length: 5 m m B. Record the length of the rear (posterior) section just AFTER you cut. This is your INITIAL rear length: 3mm C. Observe and record any behavioral responses just after your cut Day 2 Spend time under the microscope observing the cut Planaria. Answer the following questions based on your observations. NO measurements will be taken on this day. a) Are the cut fragments showing signs of regeneration? b) How did you identify the regenerating portion?…
- Topic: Earthworms 1. What is the function of the setae? 2. What is the function of the openings at segment number 14?Identify: 14. A synapomorphic feature of Rhizarians that distinguishes them from other amoeboid protistThe followings are constructed at least partly of cuticle prothorax the peritrophic membrane appendicular ovipositor |fat body |esophagus