Which among the following is exclusively marine?

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

State reasons for the following:
$(a)$ Bryophytes are called amphibians of the plant kingdom.
$(b)$ Gymnosperms are called so (naked-seeded plants).
$(c)$ Birds have wings and feathers.

$A$ plant specimen was found without differentiated roots.
$(a)$ Which plant structure helps in attaching this plant to the substratum?
$(b)$ To which group would you classify this plant?
$(c)$ Which plant could it be?

Associate the following features with appropriate organisms and their kingdom [in $(ii)$ and $(iv)$],division [in $(i)$] and phylum [in $(iii)$ and $(v)$].
$(i)$ Presence of pyrenoids
$(ii)$ Presence of heterocysts
$(iii)$ Presence of genital papillae and anus
$(iv)$ Presence of chloroplast and flagella
$(v)$ Presence of palp and parapodia

$(i)$ Draw a neat diagram of Hydra.
$(ii)$ Label mesoglea and gastrovascular cavity.
$(iii)$ Name the group of animals it belongs to.
$(iv)$ Name one species of this group that lives in colonies.