$A$: Decomposers are excluded from the food chains.
$R$: They act on all trophic levels of a food chain.

  • A
    Assertion and Reason both are correct and Reason is the correct explanation of Assertion.
  • B
    Assertion and Reason both are correct but Reason is not the correct explanation of Assertion.
  • C
    Assertion is correct,but Reason is incorrect.
  • D
    Both Assertion and Reason are incorrect.

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Which of the following are not primary producers in an aquatic ecosystem?

The changes that occur in successive seral stages to reach a climax community are:
$I.$ Changes in the diversity of species of organisms.
$II.$ Increase in the number of species and organisms.
$III.$ Increase in the total biomass.
Choose the correct option.

Generally,the food chain has how many trophic levels?

Succession proceeds from

Complete the following model of the carbon cycle by filling in $A, B, C, D, E,$ and $F$.

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