Climax stage is achieved quickly in secondary succession as compared to primary succession. Why?

  • A
    Secondary succession occurs in areas where life existed previously.
  • B
    Primary succession involves the formation of soil from bare rock.
  • C
    Soil and nutrients are already present in secondary succession.
  • D
    All of the above.

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$A$: Niche becomes general and broader during biotic succession.
$R$: Species diversity increases but organic matter is decreased.

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 order of organisms in an aquatic food chain is:

Select the incorrect match.
$I.$ Sedimentary nutrient cycle-Nitrogen cycle
$II.$ Pioneer species-Lichens
$III.$ Secondary succession-Burned forests
$IV.$ Pyramid of biomass in sea-Upright

$A$ frog,which feeds on insects,is a

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