Q. 34.2( 38 Votes )

In the following

Answer :

The levels in a food chain are:
Producers --> Primary consumers ---> Secondary consumers ---> Tertiary consumers
Example: Plant (producer) -----> Deer (Primary consumer) ------> Lion (Tertiary consumer)
According to the 10% law, only 10 percent of the total energy is available to the organism as we move down the food chain levels.
That means if the plant gets 1000J of energy, only 10% of this 1000J will be available to the next organism in the food chain.
Let us look at our question. The lion is our secondary consumer and has received 100J of energy. This 100J is 10% of the energy that the deer received. So the deer had 1000J of energy. This means that our plant got 10% more energy than the deer which is equal to 1000 x 10 =10000J.
Plant (10000J) ---10% energy passed on---> Deer (1000J) ---10% energy passed on----> Lion (100J)

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