ANSWER: Only 2
Explanation:
- Bio tiolets are designed by DRDO.
- Psychrophile bacteria is invisible to the naked eye and originated in the uninhabitable climes of Antarctica.
- The Defence Research and Development Organisation (DRDO) is using these bacteria for the bio-digester technology it developed for disposal of human waste in an eco-friendly manner.
- DRDO has already tied up with the Indian Railways for bio-toilets on trains.
- DRDO took it upon itself to take up rural sanitation as part of its Corporate Social Responsibility. The location chosen was Dhamra, which is close to the spot from where the Agni-V missile was successfully test-fired.
