Which of the following statements is not correct about energy flow in an ecosystem?

  • A
    Pyramid of energy is always upright.
  • B
    Energy flow is unidirectional.
  • C
    Energy flow is cyclic.
  • D
    Ecological efficiency is generally $10\%$.

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In any ecosystem, which trophic level has the maximum energy stored?

Assertion $A$: Heat energy is available for the functioning of a system.
Reason $R$: Some amount of energy is lost during energy transformation.
Which option is correct for Assertion $A$ and Reason $R$?

The average trophic efficiency of transfer of energy from one trophic level to the higher trophic level is called

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Identify the organism from the following that receives the least amount of energy and is considered ecologically weak?

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