In a pond, we see plants which are free-floating; rooted - submerged; rooted emergent; rooted with floating leaves. Write the type of plants against each of them.

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

Read the following statements w.r.t. features of biomes and select the correct option for tropical rain forests

$a.$ Buttress roots

$b.$ Vines, lianas and epiphytes are abundant

$c.$ Highly leached soils

$d.$ Soil has high base content

$e.$ $30-40 \;m$ tall canopy structure with $2-3$ strata only
 

Permafrost condition is characteristic feature of

Which of the following gas is most harmful for plants

Give scientific reasons : Decomposer essential in nature.

The branch of Botany dealing with the distribution of plants on the earth's surface is called