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The second stage of hydrosere is occupied by plants like
A
$Vallisneria$
B
$Azolla$
C
$Typha$
D
$Salix$
Detailed Solution
The stages of a hydrosere in order are: phytoplankton stage → rooted submerged plant stage → rooted floating and free-floating plant stage → reed-swamp stage → marsh-meadow stage → scrub (woodland) stage → forest (climax).
The second stage is therefore the submerged plant stage, occupied by plants such as $Hydrilla$ and $Vallisneria$.
$Azolla$ is a free-floating plant of the third stage.
$Typha$ belongs to the reed-swamp stage and $Salix$ to the woodland stage.
Hence the second stage is occupied by plants like $Vallisneria$.
The second stage is therefore the submerged plant stage, occupied by plants such as $Hydrilla$ and $Vallisneria$.
$Azolla$ is a free-floating plant of the third stage.
$Typha$ belongs to the reed-swamp stage and $Salix$ to the woodland stage.
Hence the second stage is occupied by plants like $Vallisneria$.