Question

In the following food chain, 100 J of energy is available to the lion. How much energy was available to the producer ?
Plant $\to$ Dear $\to$ Lion

Answer 1

According to $10\%$ law, whatever enery an organism have in a food chain only 10 % of it is tranferred to the next level and 90% of energy is always used up by the organism itself for daily works, body heat ,reproduction,etc.

$10\%$ of x = 100
x= 1000 J in deer
$10\%$ of y = 1000
y = 10,000 J in Plant