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STD 11 - 4. Animal kingdom — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 4. Animal kingdom1 Mark
MCQ
All flatworms differ from all roundworms in having
  • A
    Triploblastic body
  • ✓
    Solid mesoderm
  • C
    Bilateral symmetry
  • D
    Metamorphosis in the life history
✓

Answer

Correct option: B.
Solid mesoderm
b
Flatworms (Platyhelminthes) and roundworms (Aschelminthes) 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 includes fills the body space, i.e., space between the body wall and more specialized tissue or organs.

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