The phylum $Arthropoda$ is named so because of the presence of

Which of the following animals contains $Hemocyanin$ as a respiratory pigment?

Among the following,which are colonial insects?

Choose the false pair.

In which of the following arthropods is the development paurometabolous? The young hatched from eggs resemble the adult,often occupy the same habitat,and grow by moulting.

Match Column-$I$ with Column-$II$.

Column-$I$	Column-$II$
$(a)$. $A$ vector of disease	$(i)$ Bombyx
$(b)$. $A$ gregarious pest	$(ii)$ Limulus
$(c)$. $A$ living fossil	$(iii)$ Locusta
$(d)$. An economically important insect	$(iv)$ Culex