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Question
Which of the following is the common characteristic found in all the worms?
Which of the following is the common characteristic found in all the worms?
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Solution
The correct option is C Triploblastic
Worms are found in three phyla-Platyhelminthes, Aschelminthes and Annelida. For example,
Platyhelminthes : Tapeworms and Planaria
Aschelminthes : Wuchereria and Ascaris
Annelida : Pheretima (Earthworm) and Nereis
Organisms in all these three phyla have three germ layers- ectoderm, mesoderm and endoderm and are, hence, triploblastic.
Tapeworm, Planaria, Wuchereria, Ascaris are endo-parasites but Pheretima is not a parasite. It is a free-living organism. All the endo-parasites live in the bodies of their hosts.
Metameric segmentation of worms is only seen in the organisms of phylum Annelida.
Worms are found in three phyla-Platyhelminthes, Aschelminthes and Annelida. For example,
Platyhelminthes : Tapeworms and Planaria
Aschelminthes : Wuchereria and Ascaris
Annelida : Pheretima (Earthworm) and Nereis
Organisms in all these three phyla have three germ layers- ectoderm, mesoderm and endoderm and are, hence, triploblastic.
Tapeworm, Planaria, Wuchereria, Ascaris are endo-parasites but Pheretima is not a parasite. It is a free-living organism. All the endo-parasites live in the bodies of their hosts.
Metameric segmentation of worms is only seen in the organisms of phylum Annelida.
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