Question

In the food chain given below, if the amount of energy available at fourth trophic level is 5 kJ, what was the energy available at the producer level?​ ​

Grass → Grasshopper → Frog → Snake → Hawk​

• A. 500 KJ
• B. 50 KJ
• C. 5 KJ
• D. 5000 KJ

Answer 1

The correct option is D 5000 KJ

Solution:-​ ​

The correct answer is (c) 5000 kJ.​

According to the ten percent law, only 10% of the energy is available to the organism in the succeeding trophic level.​

• If, 5 kJ energy is available at the 4th level (snake), the amount of energy at the previous level will be 10 times more, i.e., 50 kJ.​

• So, tracing back, we get that the grasshopper (2nd level) has 500 kJ of energy and at the producer level, i.e., grass, 5000 kJ of energy will be available.​