what limits the number of trophic levels in a food chain?

why food chains generally consists of three or four steps only?

are these two questions one nd the same?

 ya ..maybe....yups it....

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Any food chain has a maximum of only 4 or 5 trophic levels.This is because according to the 10% law of transfer of energy, only 10% of the energy  of any organism at a perticular trophic level is available to another organism at the higher trophic level...So, their is very less energy available for the organism at the 4th or the 5th trophic level...

thumbs up pleaseee

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 BCOZ ACCORDING TO THE 10% LAW THE ENERGY THE ENERGY TILL THIS LEVEL HAD BECOME VERY SMALL TO BE DISTRIBUTED FURTHER.

PLZ THUMBS UP

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balls
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it is so becoz acc. to 10 % law energy is decrease at succesive trophic level .it is seen that no. of species at each trophic level is related as directly propotional to energy concerned with that troohuc level as a result population density is decreased and thats why only 3 or 4 or some time 5 trophic level are included.
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No more than five trophic levels are present in an ecosystem, most have only 4.

Explanation:

In all ecosystem, first base level of pyramid will be occupied by producers, consumers occupy higher trophic levels. Energy is lost when it is transferred from one trophic level to the next. Approximately 10% of the stored energy of a trophic level could be transferred to the consumers of next level. Thus very less number of individuals could be supported at the top level.

In a four level pyramid, only 0.1% of fixed energy ultimately reaches the top.

 
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no these are two different questions
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