MCQ
$\text{CNS}$ is mostly made of:
- AMotor neurons and sensory neurons.
- BSensory neurons and association neurons.
- ✓Association neurons.
- DMotor neurons and association neurons.
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$(i)$ The body of the cockroach is segmented and divisible into three distinct regions - head, thorax and abdomen.
$(ii)$ Blood vascular system is of closed type.
$(iii)$ They are monoecious and both seves have well developed reproductive organs.
$(iv)$ The development of P. americana is paurometabolus, meaning there is development through nymphal stage.
$R-$ Each pole receive half chromatids numbers in Anaphase