The locomotory organs of $Echinodermata$ are:

Which of the following is not an aquatic animal?

To which group do the following organisms belong and give one reason for each:
$(a)$ Cyanobacteria
$(b)$ Euglena
$(c)$ Ulothrix

Write the most striking features of the following phyla:
$(i)$ Arthropoda
$(ii)$ Amphibia
$(iii)$ Porifera

$(a)$ In which two ways do amphibians differ from fishes?
$(b)$ Identify the phylum of organisms having the following characteristics:
$(i)$ Pore-bearing animals and radial symmetry.
$(ii)$ Body spiny and radial symmetry.
$(c)$ Why do gymnosperms not require water for fertilization?

To which class of Animalia does the housefly belong? Mention any three characteristic features of this class of animals. Give two other examples of this class of animals.