What is 10 per cent law ?

Explanation

**Step-by-Step Solution:**

1. **Understanding Energy Transfer in Ecosystems**: The 10% law pertains to the flow of energy through different trophic levels in an ecosystem. It explains how energy is transferred from one level to the next.

2. **Definition of Trophic Levels**: Trophic levels refer to the different levels in a food chain or food web, which include producers (plants), primary consumers (herbivores), and secondary consumers (carnivores).

3. **Energy Flow**: According to the 10% law, when energy is transferred from one trophic level to the next, only about 10% of the energy from the previous level is passed on. The rest of the energy is lost primarily due to metabolic processes, heat, and other biological activities.

...