In the following food chain, 100 J of energy is available to the lion. How much energy was available to the producer?
Plants `to` Deer `to ` Lion

Explanation

To solve the question regarding the energy available to the producer in the given food chain (Plants → Deer → Lion), we can use the 10% law of energy transfer in an ecosystem. Here’s a step-by-step solution:

### Step-by-Step Solution:

1. **Identify the Energy at the Lion Level**:
We know that the energy available to the lion is 100 Joules.

2. **Apply the 10% Law**:
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