Select the incorrect statement regarding the heart of a cockroach.

  • A
    It is a long muscular tube.
  • B
    It is situated along the mid-dorsal line of the thorax and abdomen.
  • C
    It is differentiated into funnel-shaped chambers.
  • D
    Ostia are present on both sides of the heart chambers.

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$(ii)$ Thin branching tubes carry oxygen from the air to all the parts.
$(iii)$ The opening of the spiracles is regulated by sphincters.
$(iv)$ Exchange of gases takes place at the tracheoles by diffusion.

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