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? Questions1. 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 hydraspecimen 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, viewthis youtube video: https://www.youtube.com/watch?v=-UI531GMRTM7. If there are live hydra specimens do not add the vinegar as indicated on the labwebsite. Vinegar causes them to expel the cnidocytes. Instead, view thisyoutube that shows a jellyfish discharging the nematocyst cells:https://www.youtube.com/watch?v=6zJiBc_N1ZK8. View the preserved cnidarian specimens will be on display. They may differ fromthe ones directly mentioned in the lab website but there should be somemedusa cnidarians as well as corals and sea anemones. Please makeobservations on the available specimens. And fill in the chart below.Name of specimenCraspedacusta jellyfishPhysical descriptionPolyp or Medusa stage?Aiptasia mutabilisAcropora palmataActinia equinaTubastraea Name of specimenPhysical descriptionSponge structuresvisible (osculum, otherpores,spicules)GrantiaEuplectellaBarrel spongea. 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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Biology: The Unity and Diversity of Life (MindTap Course List)

15th Edition

ISBN:9781337408332

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter24: Animal Evolution-the Invertebrates

Section: Chapter Questions

Problem 15SQ

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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

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?

Definition Definition Organ system that helps in the digestion of food by mechanical and biochemical processes. The digestive system breaks down food into simpler components that enable the body to then absorb or transport nutrients. The human digestive system includes the gastrointestinal tract or alimentary canal and the associate glands. The organs of the gastrointestinal tract include the mouth, pharynx, esophagus, stomach, small intestine, and large intestine. The associated glands include salivary glands, liver, gallbladder, and pancreas.

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