MCQ
Chemical name of $T_4$ is:
- ATetradiodothyronine
- BTridiodothyronine
- ✓Tetraiodothyronine
- DTriiodothyronine
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Mesophy $II$ $-$ Bundle sheath
$(i)$ 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.