science
Grade-5
Easy

Question

_________ flows through a food web/chain and powers each organism at every trophic level.

  1. Nitrogen  
  2. Energy 
  3. Carbon Dioxide
  4. Photosynthesis

hintHint:

Every organism needs to consume food to do its everyday tasks, and grow and maintain its health status. And this occurs, through a series of chains.

The correct answer is: Energy


    • The energy flows through a food web or food chain and powers each organism at every trophic level. 
    • The food chain or food web involves the transfer of material from one trophic level to another. This occurs when one organism is consumed by another for its survival.  
    • For example, producers like autotrophs are consumed by primary consumers, herbivores. These are then eaten by secondary consumers called consumers which are eventually decomposed by decomposers.
    • While doing so, there is also a transfer of net energy at each successive tropic level. The received energy is used for maintenance and metabolism by the organism and the rest is passed to the next higher trophic level. Without this continuous energy transfer, the food web or food chain will collapse, organisms will die and the ecosystem would not survive.

    The food chain ensures a unidirectional flow of energy through the ecosystem, that is, from one tropic level to another. Also, energy flow decreases with each tropic level.

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