MCQ
As a tree grows older, which increases rapidly in thickness
- ✓Its heart wood
- BIts cortex
- CIts sap wood
- DIts phloem
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$R$ : It allowed the animal to have an alimentary canal longer than the body & space for storing gametes.
$(i)$ 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.