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
$IV, III, V, II\; and \;I$
$III, V, I, II\; and \;IV$
$II, IV, III, I \;and \;V$
$IV, V, III, II\; and\; I$
An ecosystem resist change because it is in a state of
In the dry weight of living beings ......$A$......$\%$ carbon present and ......$B$......$\%$ carbon dissolved in sea present on among whole earth and it is of ......$C$......$\%$ of whole carbon. $A -B - C$
Which one of the following is not a function of an ecosystem?
Earth is a/an
The sphere of living matter together with water, air and soil on the surface of earth is