Mid-Sem Exam: Characteristics of Poriferans, Cnidarians, Platyhelminthes, Nematodes and Annelids Flashcards
Memorise the characteristics of each phyla
What type of symmetry is typical of phylum Porifera?
Asymmetry
What type of symmetry is typical of phylum Cnidaria?
Radial symmetry
What type of symmetry is typical of phylum Platyhelminthes?
Bilateral symmetry
What type of symmetry is typical of phylum Nematoda?
Bilateral symmetry
What type of symmetry is typical of phylum Annelida?
Bilateral symmetry
Are Poriferans acoelomates, pseudocoelomates, or eucoelomates?
Acoelomate (has no coelom)
Are Cnidarians acoelomates, pseudocoelomates, or eucoelomates?
Acoelomate (has no coelom)
Are Platyhelminthes acoelomates, pseudocoelomates, or eucoelomates?
Acoelomate (has no coelom)
Are Nematodes acoelomates, pseudocoelomates, or eucoelomates?
Pseudocoelomate (have a body cavity that is not a true coelom, as it is not derived from mesoderm)
Are Annelids acoelomates, pseudocoelomates, or eucoelomates?
Eucoelomate/coelomate (have true coeloms derived from middle germ layer)
Which of the phylum studied in the first five weeks have true tissues?
Cnidaria, Platyhelminthes, Nematoda, Annelida (and Ctenophora)
What is the typical feeding behaviour of Poriferans?
Filter feeding (sessile); exception of predatory harp sponge
What is the typical feeding behaviour of Cnidarians?
Mostly predatory, carnivorous (either by using stinging cells or filter-feeding)
What is the typical feeding behaviour of Platyhelminthes?
Mostly parasitic. Some are predators (e.g. free-living planarians)
What is the typical feeding behaviour of Nematodes?
Mostly parasitic, some free-living eat yeast/bacteria (vinegar eels)
What are the three types of worms (those studied) and their respective phyla?
Flatworms (Platyhelminthes), roundworms (Nematoda) and segmented worms (Annelida)