The larva-like stage of $Hydra$ is:

Which of the following phyla is diploblastic?

Which of the following statement$(s)$ is/are correct regarding phylum $Coelenterata$ (Cnidaria)?
$(A)$ They are aquatic,mostly marine,sessile or free-swimming,radially symmetrical animals.
$(B)$ They have a central gastro-vascular cavity with a single opening on hypostome.
$(C)$ Digestion is extracellular and intracellular.
$(D)$ Their members are $Sycon$,$Spongilla$ and $Euspongia$.

Blind sac body plan is shown by

Jellyfish is placed in which class of $Coelenterata$?

Penetrant,volvent,and glutinant are types of