The final community of succession in plants is called .....

In a pond,we see plants which are free-floating; rooted-submerged; rooted-emergent; and rooted with floating leaves. Identify the type of plant for each of the following:

Plant Name	Type
$(1)$ Hydrilla	....................
$(2)$ Typha	....................
$(3)$ Nymphaea	....................
$(4)$ Lemna	....................
$(5)$ Vallisneria	....................

Of the total incident solar radiation,the proportion of $PAR$ is:

Initial seral stages in ecological succession:

Match the following columns:

Column-$I$	Column-$II$
$(P)$ First trophic level	$(I)$ Humans,Lion
$(Q)$ Second trophic level	$(II)$ Zooplankton,Grasshopper,Cow
$(R)$ Third trophic level	$(III)$ Phytoplankton,Grass,Trees
$(S)$ Fourth trophic level	$(IV)$ Birds,Fishes,Wolf

$A$ plant that is eaten by a herbivore,which is subsequently eaten by a carnivore,forms a/an ........