Question

calculate the amount of energy available to lion in the following food chain if plants have 20000 J OF ENERGY AVAILABLE FROM THE SUN

Answer 1

where is the food chain?
usually it is plant-deer-lion
so the answer will be 20J
use the 10% law and u will find it

Answer 2

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i) plants can trap only 1% of the sun's energy falling on them..Now ,1% of 2000J is 200J , so energy have actually 200J of energy available in them as food ( the 10 per cent law does not appu at this stage)

ii) the plants are eaten up by deer. now , according to 10 per cent law, 10%of 200J , that's 20J of energy will be available in the deer as flesh of food.

iii) The deer will transfer 10% of its 20J energy to the lion . Thus , the food energy available to the lion will be 10% of 20J which comes to 2J

the above results can be shown more clearly as follows:-

$sun \: \frac{20000j}{1\% \: absorbed} \: \: plants \: \frac{200j}{10\%of \: 200j} \: deer \: \frac{20j}{10\%of \: 20j} \: lion \: \frac{2j}{}$