The 'Reed-swamp' stage refers to which of the following?

  • A
    $A$ stage formed by an increase in the proportion of free-floating plants in succession.
  • B
    $A$ successional stage showing a mixture of both terrestrial and aquatic conditions.
  • C
    $A$ stage formed when an aquatic habitat is suddenly converted into a terrestrial habitat.
  • D
    $A$ stage characterized by marshy,grassy meadows.

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$(b)$ Detritus food chain $(DFC)$ begins with dead organic matter.
$(c)$ Each trophic level has a certain mass of living material at a particular time called as standing crop.
$(d)$ Species composition and stratification are two main structural features of an ecosystem.

In ecological succession,the communities in near equilibrium with the environment are called:

The following chart shows the phosphorus cycle in a terrestrial ecosystem. Select the correct option for the four labels $a, b, c$ and $d$ shown in the diagram.
$a$ - $b$ - $c$ - $d$

The world's most problematic aquatic weed is

$A$ food chain consists of:

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