Biology 2e
Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Q: The phylum Platyhelminthes has what type of symmetry?
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Concept explainers

Animal Phylogeny
Cladistics is a method of biological classification where organisms are classified based on their ancestors and their relationship with them. It is defined as the concepts and methods for determining the branching patterns of evolution and evolutionary h…
Question

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=UnjwvtFvyeQ
Describe the movement of the vinegar eels.
Do they have a complete or incomplete digestive system?

Questions 1. Does the hydra illustrate the polyp or the medusa stage? 2. How many germ layers does the hydra contain? 3. What type of symmetry is seen in the hydra? 4. Can you find the hydra tentacles? How many tentacles does your hydra specimen contain? 5. Name the stinging cells present on the tentacles that are unique to cnidarians. 6. Explain the movement of the hydra if live specimens are available. If not, view this youtube video: https://www.youtube.com/watch?v=-UI531GMRTM 7. If there are live hydra specimens do not add the vinegar as indicated on the lab website. Vinegar causes them to expel the cnidocytes. Instead, view this youtube that shows a jellyfish discharging the nematocyst cells: https://www.youtube.com/watch?v=6zJiBc_N1ZK 8. View the preserved cnidarian specimens will be on display. They may differ from the ones directly mentioned in the lab website but there should be some medusa cnidarians as well as corals and sea anemones. Please make observations on the available specimens. And fill in the chart below. Name of specimen Craspedacusta jellyfish Physical description Polyp or Medusa stage? Aiptasia mutabilis Acropora palmata Actinia equina Tubastraea
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Transcribed Image Text:Questions 1. Does the hydra illustrate the polyp or the medusa stage? 2. How many germ layers does the hydra contain? 3. What type of symmetry is seen in the hydra? 4. Can you find the hydra tentacles? How many tentacles does your hydra specimen contain? 5. Name the stinging cells present on the tentacles that are unique to cnidarians. 6. Explain the movement of the hydra if live specimens are available. If not, view this youtube video: https://www.youtube.com/watch?v=-UI531GMRTM 7. If there are live hydra specimens do not add the vinegar as indicated on the lab website. Vinegar causes them to expel the cnidocytes. Instead, view this youtube that shows a jellyfish discharging the nematocyst cells: https://www.youtube.com/watch?v=6zJiBc_N1ZK 8. View the preserved cnidarian specimens will be on display. They may differ from the ones directly mentioned in the lab website but there should be some medusa cnidarians as well as corals and sea anemones. Please make observations on the available specimens. And fill in the chart below. Name of specimen Craspedacusta jellyfish Physical description Polyp or Medusa stage? Aiptasia mutabilis Acropora palmata Actinia equina Tubastraea
Name of specimen Physical description Sponge structures visible (osculum, other pores, spicules) Grantia Euplectella Barrel sponge a. What type of symmetry is displayed in the sponge specimens? 2. Search for microscopic view the Grantia slides. Look for spicules. a. What is the function of spicules? b. Do sponges contain true tissues? c. Can you find any collar cells in the slide? d. What is the function of the collar cells? e. Can you find any epidermal cells in the sponge slide? f. What is the function of the epidermal cells?
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Transcribed Image Text:Name of specimen Physical description Sponge structures visible (osculum, other pores, spicules) Grantia Euplectella Barrel sponge a. What type of symmetry is displayed in the sponge specimens? 2. Search for microscopic view the Grantia slides. Look for spicules. a. What is the function of spicules? b. Do sponges contain true tissues? c. Can you find any collar cells in the slide? d. What is the function of the collar cells? e. Can you find any epidermal cells in the sponge slide? f. What is the function of the epidermal cells?
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