Biology Questions and Answers
there is alternation between polypoid
and medusoid freproduce asexually oorms. Triginatinhe polypsg
medusae that then liberate gametes.
The male aunder water to form thnd female gametes une zygote thatite (^)
then develops into larva and later
originates another polyp.
The form that reproduces asexually is
the polyp. Polyby budding in Obelia anps give birth to medusaed by
strobilization in Aurelia.
- What is the name of the
larva of corals and sea
anemones? What is the
biological importance of that
larval stage?
Sexual reanemones have a larval stage and theproduction in corals and sea (^)
larva is called planula.
Many marine animals are sessile or
practicallyand sea anemones. The mobile larval sessile, like sponges, corals
stage of their life cycle provides better
spatial distribution of these species.
- What are the main classes
into which the phylum is
divided? What are some
examples of each and in which
form (polyp or medusae) are
they found?
Coelenterates armain classes: hydrozoans, scyphoe divided into threezoans (^)
and anthozoapolypoid form predominates ans. In hydrozoans thnd e
examples are hydras, by-the-wind-
sailors and Obelia. In scyphozmain phase is the medusoid and theoans the
best known example is the common
jellyfish (Auris only the polypoid form and corals andelia). In anthozoans there (^)
sea anemones are notable in this group.
- What does radial
symmetry means? What is the
type of symmetry found in
chordates? Which are other
phyla of the animal kingdom
that present species with
radial symmetry?
Radial symmetry means (biologically)
that thin a radial or circular pattere animal structures are situaten around ad
center point with nonexistence of sides,
like right osymmetry ir left. An altern which structuresnative typ are e of
placed equally in the sides of a
longitudinal axis(the symmetry p is the lateral symmresent in human etry
beings, for example).
Chordates present lateral symmetry.
Besides cnidarians aphylum with species presentinnother animalg
secondary raphylum Echinodermata.dial symmetry is (It is consid the (^) ered
that the simplicity of poriferans does not
characterize any symmetry.)
- What are corals?
Corals are characterizpolypoid shape, sessilityed by their and slow (^)
growth and secretion of a solid skeleton
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