Choose the incorrect statement.

  • A
    Food webs exist in nature.
  • B
    Food chains or food webs are formed because of interdependency (organisms depend on one another for food).
  • C
    Primary consumers are herbivores.
  • D
    $DFC$ begins with only dead plant matter.

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What is true about the phosphorus cycle?
$I.$ Rocks are the natural reservoirs of phosphorus.
$II.$ Weathering of sedimentary rocks makes phosphate available to the soil.
$III.$ Herbivores and carnivores obtain phosphorus from plants directly or indirectly.
Choose the correct option.

Which of the following are known as the 'pioneer species' in primary succession?

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

Which one of the following animals may occupy more than one trophic levels in the same ecosystem at the same time?

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