How many zones are present in a Biosphere reserve ?

Explanation

### Step-by-Step Solution:

1. **Understanding Biosphere Reserves**: Biosphere reserves are designated areas aimed at conserving biological diversity and promoting sustainable development. They serve as in-situ conservation sites for various species of flora and fauna.

2. **Identifying the Zones**: Biosphere reserves are divided into three distinct zones, each serving a specific purpose in conservation and human interaction.

3. **Core Zone**: The first zone is the **Core Zone**. This area is legally protected, meaning that no human activities are allowed here. It serves as a sanctuary for wildlife and is crucial for the conservation of biodiversity.

...