All Jharkhand Competitive Exam JSSC, JPSC, Current Affairs, SSC CGL, K-12, NEET-Medical (Botany+Zoology), CSIR-NET(Life Science)

Thursday, October 1, 2020

Phylum Platyhelminthes (Flatworms) - NEET-Biology

 Phylum Platyhelminthes (Flatworms)

Important Characteristics:

  • Acoelomate, triploblastic, bilaterally symmetrical organisms.
  • Digestive, skeletal, circulatory & respiratory systems are absent, parenchymal gland serves as hydroskeleton.
  • The body is soft & dorso-ventrally flattened. It may be leaf-like ribbon-like. It is without segmentation.
  • Possess the organ-system level of organization.
  • The organ-system level of organization.
  • The nervous system is ladder-like. It comprises the brain & two main longitudinal nerve-chords connected at intervals by transverse commissures.
  • The excretory system includes characteristics of flame-cells leading into tubules that open out by one or more excretory pores.
  •  Hermaphroditic, often with elaborate precautions for minimizing self-fertilization.
  • Fertilization is internal. Life history often includes larval stages.
  • Asexual reproduction by transverse fission occurs in some forms.
  • Example- Taenia (Tapeworm), Fasciola (Liver fluke)



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