MediumBiologyHigh School (11–12)Diversity of Living Organisms › Basis of Animal ClassificationNumerical
A segmented worm has 96 segments. Every segment except the first and the last carries a ring of 70…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A segmented worm has segments. Every segment except the first and the last carries a ring of tiny bristles.
- How many segments carry a ring?
- How many bristles does the worm have in all?
- Name the kind of segmentation that such a worm shows.
Need a reminder? The key ideaShow
Metameric segmentation: the body is divided outside and inside into segments, with some organs repeated (annelids, arthropods, chordates). The notochord is a rod formed from mesoderm on the dorsal side of the embryo; chordates have it. Key: cellular level, Porifera; radial and diploblastic, Coelenterata or Ctenophora; bilateral and triploblastic: no cavity, Platyhelminthes; pseudocoelom, Aschelminthes; coelom, Annelida to Chordata.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Rings. segments carry a ring.
Step 2. Bristles. bristles.
Step 3. The kind. The body is divided outside and inside, with organs repeated: metameric segmentation.
Answer: ; ; metameric segmentation.
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