Biology Questions and Answers
Nematodes
- What are examples of
nematodes?
Ascaris, hookworm and filaria, all
parasitesnematodes (also kn of humans, arown ase examples o f
roundworms).
- Are nematodes exclusively
parasites?
There are parasitic roundworms,
including parasites oare also free-living nf plants, but thereematodes.
- What is the typical
morphological feature of
nematodes that differentiates
them from platyhelminthes?
Nematoroundworms. As thdes are also kne name indicatesown as (^)
they are not flat like platyhelminthes. In
evolutionary nematodes the first complete digestivegrounds with the (^)
system appears, with mouth and anus,
and the pseudocoelom is also a novelty.
- What are the morphological
similarities and differences
between nematodes and
annelids?
Nematocylindrical eldes, like ongated bannelids, havody. Annelidse a (^)
differentiate from nematodes bpresenting a segmented body (bodyy (^)
divided into metameres) and so they
are called segmented worms.
- Are nematodes diploblastic
or triploblastic animals?
Just like platyhelmiare triploblastics, i.e., they presentnthes, nematodes
three germ layers (ectoderm,
mesoderm and endoderm). - What is the main
evolutionary innovation
presented by nematodes?
What is the advantage of that
innovation?
The main enematodes is the completvolutionary innovation e digestiveof (^)
system, with two oanus). penings (mouth and
Since the ingestion anprocesses can occur in differentd the defecation
extremities of the digestive tube, beings
with a the advantage complete digestive system havof ingesting new food e
while residuals of still inside the body and not yetalready eaten food are
eliminated.
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