Bio Ch33 Pretest abc
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10 terms
Terms | Definitions |
|---|---|
 The animal phylum most like the protists that gave rise to the animal kingdom is _____. | Porifera ( Evidence that supports this includes the lack of true tissue in sponges and the close similarity between choanocytes and choanoflagellates.) |
| Which of the following is not a characteristic of cnidarians? | mesoderm ( Cnidarians are diploblastic, lacking mesoderm.) |
| All of the following are true of the phylum Platyhelminthes except _____. | they are all parasitic ( Planarians are an example of a free-living flatworm. Turbellarians are not usually parasitic.) |
| Some species of rotifers consist solely of females. Their method of reproduction is described as _____. | parthenogenesis ( The females lay unfertilized eggs that develop into females.) |
| Bryozoans, phoronids, and brachiopods are collectively referred to as _____. | lophophorates ( The lophophore is a structure common to these three phyla that bear ciliated tentacles.) |
| The phylum Nemertea, the proboscis worms, differs from the phylum Platyhelminthes in that proboscis worms _____. | have a complete digestive tract ( Flatworms—with the exception of tapeworms, which lack a digestive tract—have a gastrovascular cavity.) |
| Members of the phylum Mollusca _____. | are soft-bodied and usually covered by a shell ( Members of the phylum Mollusca are soft-bodied and are usually covered by a shell.) |
| A marine biologist dredges up a small animal from the bottom of the ocean. It is uniformly segmented, with short, stiff appendages and soft, flexible skin. It has a complete digestive system and an open circulatory system, but no skeleton. Based on this, you determine that the animal must be a(n) _____. | annelid (The description matches the characteristics of annelids.) |
| What structure is responsible for gas exchange in most spiders? | book lungs ( The extensive surface area of book lungs is a structural adaptation that enhances the exchange of O2 and CO2 between the hemolymph and air.) |
| Which of the following are thought to be most closely related to humans? | sea stars ( Both humans and sea stars are deuterostomes.) |
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