Identify the basic components of an ecosystem.

  • A
    Producers and decomposers
  • B
    Unidirectional flow of energy and cycling of materials
  • C
    Submerged and marginal plants
  • D
    Both $A$ and $B$

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The following diagram shows the phosphorus cycle. Identify the producers in it.

Distinguish between:
$(a)$ Grazing food chain and detritus food chain
$(b)$ Production and decomposition

Given below is a simplified model of phosphorus cycling in a terrestrial ecosystem with four blanks $(A-D)$. Identify the blanks.

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