Biology Questions and Answers
Cnidarians
- What are some examples of
cnidarians? In which
environments can these
animals be found?
Jellyfish, hyanemones are good examdra, corals and seaples. All of (^)
them are aquatic and most live in thesea.
- What are the two main
morphological patterns of
cnidarians? Concerning
locomotion how do these
forms differentiate from each
other?
Morphologically,polyps or medusae. cnidariaPolyps arens classify as
cylindrical anconvex, like an umbrella. Both shapd medusae are circulares (^)
have tentacles.
In general polyps are sessile but some
species, like halternating contact points on theydra, can move by
substrate and performing somersaults.
Medusae can by contraction omove expelling water jf the body. ets
Some cnidariansmedusoid forms in t alternate heir life cycle.polypoid and
- Concerning tissue
complexity how different are
cnidarians from poriferans?
Cnidarians hdifferentiation,ave true tissue they present distinct (^)
organized tissuespresent only some d in the body. Poriispersed specializedferans
cells with no tissue differentiation.
- Which are the germ layers
present in cnidarians? Which
tissues of the animal do they
originate?
These beings present ectoendoderm, two germ layers. Animalsderm and (^)
with only two gdiploblastic animals.erm layers are called
The ectoderm gives birth epidermis and the endoderm orito the (^) ginates
the covering of the digestive cavity.
- Why is the digestive system
of these animals called
incomplete?
Incomplete digestive system is that in
which the opening. digestive cavity has only one
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