Explanation:

Both statements 1&3 are correct.

• Natural farming is defined as a “chemical- free farming and livestock based”. North East India has traditionally been organic, and the consumption of chemicals is far less than the rest of the country.
• Sikkim is the first state in the world which became a fully organic state. 
• Natural farming is in sync with the Sustainable Development Goal-2 i.e., targeting ‘end hunger, achieve food security and improved nutrition and promote sustainable agriculture’. 
• Participatory Guarantee System (PGS) is a process of certifying organic products produced by natural farming. It ensures that their production takes place in accordance with laid-down quality standards. The certification is in the form of a documented logo or a statement. 

Hence option 3rd is correct.