Out of the following biogeochemical cycles, which ones are gaseous?
$I.$ Sulphur
$II.$ Phosphorus
$III.$ Nitrogen
$IV.$ Carbon
Choose the correct option.

  • A
    $Only \; I$
  • B
    $Only \; II$
  • C
    $Only \; IV$
  • D
    $III \; and \; IV$

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Match the ecological terms given in Column $I$ with its correct explanation in Column $II$.
Column $I$ (Terms)Column $II$ (Explanation)
$1$. Stratification$a$. Horizontal distribution of different species
$2$. Zonation$b$. Rate of generation of Biomass in an ecosystem
$3$. Productivity$c$. Breakdown of detritus
$4$. Decomposition$d$. Vertical distribution of different species
Choose the correct option.

The biotic part of the ecosystem includes:

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