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12.Ecosystem
normal
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
A
$IV, III, V, II\; and \;I$
B
$III, V, I, II\; and \;IV$
C
$II, IV, III, I \;and \;V$
D
$IV, V, III, II\; and\; I$
Solution
Various stages in hydrarch are
Phytoplankton
$1$ (Blue-green algae, bacteria)
Rooted submerged
+ (Hydrilla, Utricularia)
Floating stage
$1($ Nelumbo, Nymphaea, Azolla $)$
Reed swamp stage
+ (Lemna, Wolffia)
Sedge meadow stage
$1$ (Scirpus, Typha)
Woodland stage
$\downarrow$ (Juncus, Cyperus)
Forest stage
Standard 12
Biology
