Question

Calculate the amount of energy available to tiger in the following food chain if plants have 30,000 J of energy available from the Sun:

Plant ---> Deer -----> Tiger

Answer 1

Plants can trap only 1% of the Sun's energy falling on them. Now, 1% of 30,000J is 300J which is the energy available to plants.
The plants are eaten up by deer. According to 10% law,1.0% of 300J, i.e.,30 J of energy will be available to deer as food.
The deer will transfer 10% of its 30J energy to the tiger. Thus, the food energy available to the tiger will be 10% of 30J which is 3J.