Which of the following is another characteristic of the animal group that first possesses a complete digestive system?

  • A
    Males are smaller than females in size.
  • B
    They are dorso-ventrally flattened acoelomate animals.
  • C
    Closed type of circulatory system.
  • D
    Planula larva is present.

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Excretory pores present in $Ascaris$ are

Choose the correct option for characters of roundworm.
$(I)$ Body is circular in cross-section.
$(II)$ Parasite found in animals and plants.
$(III)$ Organ-system level of body organization.
$(IV)$ Incomplete digestive system.

The size of the female $Ascaris$ $lumbricoides$ is:

Syncytial epidermis occurs in

Which characteristic is possessed by Ascaris (roundworm)?

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