Radial symmetry occurs in

To which family do pigeons and doves belong?

Identify the mismatch among the following pairs:

What is common between the trichocysts of $Paramecium$ and the nematocysts of $Hydra$?

How many of the following animals are homeothermic (warm-blooded)?
Rattus,Macropus,Balaenoptera,Columba,Calotes,Crocodilus,Naja,Hyla,Rana,Neophron,Tigris

Match the following columns and select the correct option:

Column-$I$	Column-$II$
$(a)$ Gregarious pest	$(i)$ Asterias
$(b)$ Radial symmetry in adults and bilateral symmetry in larvae	$(ii)$ Scorpion
$(c)$ Book lungs	$(iii)$ Ctenoplana
$(d)$ Bioluminescence	$(iv)$ Locusta