Question

33. In the following food chain plants have 50,000 J of energy. (3)

Plant → Deer →Tiger

(a) Calculate the amount of energy available to tiger.

(b) Calculate the amount of energy of sunlight that falls on the plant and converted into food energy.

(c) Give reason why a food chain can’t have more than four trophic levels?​

Answer 1

Answer:

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.