Food Chains And Food Webs

    Energy Transfer In a Food  Chain

A food chain shows how energy,in the form of food,is transferred form one organism to another.

Energy is transferred along food chains from one stage to the next. But not all of the energy available to organisms at one stage can be absorbed by organisms at the next one. The amount of available energy decreases from one stage to the next.

Some of the available energy goes into growth and the production of offspring. This energy becomes available to the next stage, but most of the available energy is used up in other ways:

  • energy released by respiration is used for movement and other life processes, and is eventually lost as heat to the surroundings
  • energy is lost in waste materials, such as faeces.

             Pyramids of Numbers

                      

The population of each organism in a food chain can be shown in a sort of bar chart called a pyramid of numbers. The more organisms there are, the wider the bar. The producer in the food chain always goes at the bottom of the pyramid of numbers.

Energy is lost to the surroundings as we go from one level to the next, so there are fewer organisms at each level in this food chain. A lot of clover is needed to support the snail population.A thrush eats lots of snails, and a hawk eats lots of thrushes, so the population of hawks is very small.

Made by Irtaza Tanvir

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