Members of the phylum porifera have all of the

Question # 00371799 Posted By: dr.tony Updated on: 08/26/2016 12:55 PM Due on: 08/26/2016
Subject Biology Topic General Biology Tutorials:
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Members of the phylum porifera have all of the following characteristics except

specialized cell but no tissues

water flows through canals of the body

stationary animal

hollow body cavity for food


Oyster fishermen have trouble with sea stars (starfish) eating their oysters. They used to pick them up, chop the sea stars in half with a knife and return them to the ocean. Why was this not effective?

the internal organs of sea stars release chemicals that are toxic to shellfish, including oysters

sea stars do not actually eat oysters

sea stars can regenerate so each individual that was chopped in half became two new individuals

actually, it was quite effective and sea stars are not endangered


You have an unidentified animal that has radial symmetry, two laters of tissue and a hollow cavity to digest food. Therefore you are looking at a(n)

Cnidarian

Echinoderm

Platyhelminth

Nematode


Which phylum fits the following characteristic? "three tissue layers, no body cavity"

Echinodermata

Annelida

Platyhelminthes

Nematoda


Which phylum meets the following characteristic? "entrance and exit the same in the digetive tract"

Cnidaria

Platyhelminthes

Porifera

Cnidaria and Platyhelminthes

Cnidaria and Arthropoda


Which of the following are not arachnids?

spiders

horseshoe crabs

scorpions

ticks

all of the above are arachnids


Which of the following structures are associated with arthropods?

exoskeleton

jointed appendages

modified segments

respiratory structures

all of the above

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