Question

Consider the following food chain:

Grass → Grasshopper → Frog → Snake → Eagle

If the amount of energy available at third trophic level is 50 kJ, the available energy at the producer level was:

Options

• 0.5 kJ

• 5 kJ

• 500 kJ

• 5000 kJ

Answer 1

5000 kJ

Explanation:

According to the 10% Law of Energy Transfer, only 10% of energy moves to the next trophic level. Since the third trophic level (Frog) has 50 kJ, the energy at the second trophic level (Grasshopper) is 50 × 10 = 500, the producer level (Grass) must have 500 × 10 = 5000 kJ of energy.