Biosphere reserve was initiated in which year?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Concept of Biosphere Reserve**:
- A biosphere reserve is a designated area that aims to conserve biodiversity and promote sustainable development. It is part of in-situ conservation, which means conserving species in their natural habitats.

2. **Identifying the Purpose of Biosphere Reserves**:
- The main goal of biosphere reserves is to protect ecosystems, preserve biodiversity, and support research and education regarding conservation.

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