MCQ
Which of the following is not applicable in cockroach?
  • A
    Blood from sinuses enter the heart through ostia.
  • B
    The haemolymph is composed of coloured plasma and haemocynine.
  • C
    Blood flow in the haemocoel.
  • D
    Blood is known as haemolymph.

Answer

B. The haemolymph is composed of coloured plasma and haemocynine.
Explanation:
Blood vascular system of cockroach is an open type. Blood vessels are poorly developed and open into space (haemocoel). Visceral organs located in the haemocoel are bathed in blood (haemolymph). The haemolymph is composed of colourless plasma and haemocytes. Blood from sinuses enter heart through ostia and is pumped anteriorly to sinuses again.

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