What will be the P/R ratio of a climax community and a pioneer community? What explanation could you offer for the changes seen in P/R ratio of a pioneer community and the climax community? 

Explanation

### Step-by-Step Solution

1. **Understanding P/R Ratio**:
- The P/R ratio is the ratio of Gross Primary Production (P) to Community Respiration (R).
- In simpler terms, it measures the balance between the amount of energy produced by photosynthesis (P) and the amount of energy used by respiration (R) in a community.

2. **P/R Ratio in Climax Community**:
- In a climax community, the P and R are approximately equal.
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