‘Ex situ’ approach for conserving biodiversity:
- Ex situ conservation refers to the conservation of species outside their natural habitats. This method is used when in situ conservation is not possible. The main goal is to preserve species by maintaining them in controlled environments.
Examples:
1. Botanical gardens: These are places where plants are grown and conserved outside their natural habitat. They help protect endangered plant species and provide research opportunities.
2. Zoos and aquariums: These institutions house endangered animals in artificial environments and play a crucial role in breeding programs for species at risk of extinction.
A battery of emf \( E \) and internal resistance \( r \) is connected to a rheostat. When a current of 2A is drawn from the battery, the potential difference across the rheostat is 5V. The potential difference becomes 4V when a current of 4A is drawn from the battery. Calculate the value of \( E \) and \( r \).