MCQ
Teeth in chondrichthyes are modified
- ✓Placoid scales
- BCycloid scales
- CCtenoid scales
- DRhomboid scales
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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.