The question asks us to identify the biosphere reserve that is not part of India. A biosphere reserve is an area that promotes the conservation of biodiversity while also allowing for sustainable development.

Option 1: Agasthyamalai - This is a biosphere reserve located in the Western Ghats of India, covering parts of Kerala and Tamil Nadu. It is known for its rich biodiversity and the presence of the Agastya hill, a sacred site.

Option 2: Nokrek - This is a biosphere reserve located in the state of Meghalaya in northeastern India. It is known for its unique ecosystem and the presence of several endemic species.

Option 3: Great Nicobar - This is a biosphere reserve located in the Nicobar Islands of India. It is known for its diverse flora and fauna, including the presence of endangered species such as the Nicobar megapode.

Option 4: Great Himalayan - This is not a biosphere reserve of India. The correct answer is Option 4. The Great Himalayan region is a mountainous area that spans several countries including India, Nepal, Bhutan, and Tibet. While this region is known for its ecological importance, it is not specifically designated as a biosphere reserve.

In conclusion