The locomotory organs of $Echinodermata$ are:

What are gymnosperms? Give two characteristics.

Which among the following phyla is exclusively marine?

List the basic criteria for classifying the Plantae kingdom into various groups. Identify the following specimen given in the image and write its characteristic features.

Define the following terms and give one example of each:
$(a)$ Bilateral symmetry
$(b)$ Coelom
$(c)$ Triploblastic

Give examples for the following:
$(a)$ Bilateral,dorsiventral symmetry is found in ...............
$(b)$ Worms causing disease elephantiasis is ..............
$(c)$ Open circulatory system is found in ............. where coelomic cavity is filled with blood.
$(d)$ ............... are known to have pseudocoelom.