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.
$a$ - $b$ - $c$ - $d$

  • A
    Detritus - Rock minerals - Producers - Litter fall
  • B
    Litter fall - Producers - Rock minerals - Detritus
  • C
    Detritus - Rock minerals - Producers - Litter fall
  • D
    Producers - Litter fall - Rock minerals - Detritus

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Which of the following organisms convert plant matter into animal matter?

$X-$ Atmospheric input of phosphorus through rainfall is much smaller than carbon input.
$Y-$ The exchange of phosphorus between organisms and the environment is negligible.

Which of the following statements is incorrect regarding the phosphorus cycle?

Sparrow eats seeds. Afterwards, it eats insects. In which trophic level does the sparrow belong in both situations, respectively?

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