Plants like Rhizophora and Avecennia grow on the sea shores under saline condition. For this they have special roots for respiration which are called
Prop roots
Climbing roots
Floating roots
Pneumatophores
Some of the stages in the hydrarch are labelled as
$I.$ Marsh meadow stage
$II.$ Reed swamp stage
$III.$ Submerged plant stage
$IV.$ Phytoplankton stage
$V.$ Submerged free floating plant stage
Identify the choice that represents the correct sequence of these stages
About how much water is recycled in the form of rains per year
Volcano eruption disturbs
Crystalline rocks are natural source of biogenetic element