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Question
In the following food chain, 100 J of energy is available to the lion. How much energy was available to the producer?
Plants → Deer → Lion
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Solution
Plants → Deer → Lion
It is given that 100 J of energy is available to lion.
Let the amount of enrgy available to deer be x Joules.
According to 10% law, only 10% energy from deer must have been transfered to lion so, energy available to deer can be calculated as,
⇒ 10% of x = 100 J
⇒ `10/100xxx=100 J`
`therefore x=100J`
∴ Energy available to the deer = 1000 J
Let the energy available to the producer be y J.
By problem,
⇒ 10% of y = 1000 J
⇒ `10/100xxy =1000J`
⇒ y = 10,000 J.
So we have found that energy available to producer is 10,000J.
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