MCQ
In an open circulatory system.
- ✓There is no distinction between the blood and the tissue fluid
- BOf tissue fluid is absent
- CNo need of blood vessels
- DOpen space or sinuses are absent.
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$(i)$ Cockroaches are brown or black bodied animals that are included in class insecta of phylum arthropoda.
$(ii)$ Males bear a pair of short, thread like anal styles which are absent in females.
$(iii)$ Heart of cockroach consists of elongated muscular tube lying along mid dorsal line of thorax and abdomen.
$(iv)$ The nymph grows by moulting about $13$ times to reach the adult form.