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  4. All flat worms differ from all round worms in having

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Q. All flat worms differ from all round worms in having

Delhi UMET/DPMTDelhi UMET/DPMT 2009

Solution:

Flat worms (Platyhelminthes) and roundworms achelminthes) both possess triploblastic body bilateral symmetry and metamorphosis in the life history. But flat worms differ from all roundworms in having solid mesoderm. The mesodermally derived tissue includes a loose tissue called parenchyma and this tissue fills the body space, ie, space between the body wall and more specialised tissue or organs.