zoology 102 lab #3 quiz

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Common names of animals in group Cnidaria and be able to recognize them visually

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sea anemone, jelly fish, coral


illustrate the evolutionary relationship between Porifera, cnidaria, and plattys

Porifera (no tissues)

Cnidaria (diploblastic)

Platty (triploblastic)


Compare the 3 phyla according to symmetry, presence of tissue, if tissues present whether diploblastic (tree)

Porifera (asymmetry)

Cnidaria (radial, diploblastic)
Patty (bilateral, triploblastic)


Gas Exchange in: Porferia, Cnidaria, and Platty

Porferia: diffusion

Cnidaria: diffusion

Patty: diffusion


Obtain nutriments in: Porferia, Cnidaria, and Platty

Porferia: passive suspension feeding

Cnidaria: nematocyst

Patty: extending pharynx able to travel by nervous system


Excretion of nitrogenous wastes in: porferia, Cnidaria, and Platty

Porferia: diffusioin

Cnidaria: diffusion

patty: diffusion (water is by flame cells)


gas distribution in: porferia, cnidaria, and patty

porferia: ameobocytes

Cnidaria: GVC

patty: GVC


nervous system in: Porferia, cnidaria, and patty

porferia: none

cnidaria: not cephaliated (nerve net)

Patty: cephalization


Characteristics of Cnidaria

- first phylum with nerve and muscle tissue

-hydrostatic skeleton


-batch feeding



Describe and draw the basic structure of cnidarians (medusa and polyp) labeling the following: Tisseud derived from endoderm, tissue derived from ectoderm, gelatinous nonliving material (mesoglea).

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Describe how an alteration of form between medusa and polyp during the life style is adaptive.

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Adaptive because they are able to exploit different environments


Relate cnidarian's symmetry to their mobility and feeding strategy

Radial symmetry -> no cephalization -> sessile (doesn't waste energy being mobile since its feeding strategy doesn't need mobility)


Describe the structure of a hydrostatic skeleton. Explain how a cnidarian like an anemone can change shape by longitudinal and circular muscles acting on the hydrostatic skeleton.

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Explain how anions and jellyfish obtain food and the role the nemacystes play. Explain how anemones and jellyfish distribute nutrients to all cells of the body.

Sessile, but wait for prey to touch tenticles so that nemacyotes can shoot out paralyzing the prey. Brings food to GVC (chemical digestion) and then is distributed by the branches of the GVC with current created by cilia


What are zooxanthellae, where are they located, and what role do they play in the life of some cnidarians?

Zooxanthellae are algae (photosynthetic cabalities) and it has a symbiotic relationship with cnirdairans, offering them oxygen while they get carbon dioxide


Explain how cnidarians obtain oxygen and get rid of carbon dioxide and other wastes/ The gas exchange strategy used by cnidarians is simply and does not require a lot of engird expenditure-- what features of their anatomy allow for a simple strategy; what constraints does it out on these animals.

each tissue layer is only one cell layer thick, allowing diffusion to occur. (cells are on the surfaces of the animal)

-batch feeding kind of suck because they have to be selective in when the take in nutrients which may not be that much depending on what comes at the time


Give examples of how Cnidarians anatomy is designed to increase surface area and why this is significant

hydrostatic skeleton and muscles???


List the common names of animals in this phylum and be able to recognize them visually

tape worms, flukes, flatworms


list and describe the distinguishing characteristics of phylum platty


-bilaterial sym


-batch feeding


draw the cross section of a typical living flat worm, labeling: tissue derived from endoderm, tissue derived from ectoderm, tissue derived from mesoderm

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Posterior, dorsal, ventral when referring to bilateral animal

anterior (head)

Posterior (feet)

ventral (stomach)

bilateral (back)


Explain the interrelationship between how plates reform the basic functions of staying alive such as gas exchange and their body plan and overall size and shape

cephalized- helps with movement, hiding from predators and capturing prey

gas exchange is made possible because their cells are packed closely together due to how thin the organism is


Describe how the mesenchymal hydrostatic skeleton functions in plattys

middle layer is LIVING with cells that are all individually filled with fluid that are compatible with antagonistic muscles


Explain how symmetry, feeding strategy, complexity of muscles, and nervous system (brain) are interrelated

bilateral -> cephalized -> mobile (muscles have direction) -> can hunt for food


describe the structure of the GVC of a planeria; describe its purpose and explain how its shape suits its purpose. Explain how a planera obtains food digests it, and gets nutrients to all parts of the body.

pharynx, GVC breaks down food chemically and then branches out to allow food to pass through?


Explain how a flat worm obtains oxygen and gets rid of carbon dioxide and other wastes. Some free living flatworms are terrestrial but must live in moist areas, how is this constraint related to the way they do gas exchange?

GVC through diffusion because their cells are close together. they need water for diffusion


Relate specialization of parasitic flatworms to their way of life

-no digestive sysmte but can abroad already digested nutrients in human digestive trac

-since they have a complexlife cycle, they are hermaphodites so that they can produce hella eggs in hopes one of them will survive