Comparing Areas of Indian Biosphere Reserves

The question asks us to identify the biosphere reserve among the given options that has the largest geographical area. To answer this, we need to compare the approximate areas of the Sunderban, Pachmarhi, Nilgiri, and Gulf of Mannar Biosphere Reserves.

Understanding Biosphere Reserves

A biosphere reserve is a special protected area designated by UNESCO under its Man and the Biosphere (MAB) Programme. These areas are intended to promote conservation along with sustainable use. They are typically divided into three zones:

• Core Area: Strictly protected, undisturbed natural area.
• Buffer Zone: Area surrounding the core, used for research and education activities.
• Transition Area: Outermost area where sustainable development is promoted with local community involvement.

The total area of a biosphere reserve includes all these zones.

Area Comparison of Given Biosphere Reserves

Let's look at the approximate areas of the biosphere reserves listed in the options:

Determining the Largest Biosphere Reserve

Based on the approximate areas, we can see the following:

• Sunderban Biosphere Reserve (Indian part) has an area of about $9,630\ km^2$.
• Pachmarhi Biosphere Reserve has an area of about $4,926\ km^2$.
• Nilgiri Biosphere Reserve has an area of about $5,520\ km^2$.
• Gulf of Mannar Biosphere Reserve has the largest area among the options, around $10,500\ km^2$. This vast area includes a significant marine ecosystem.

Therefore, the Gulf of Mannar Biosphere Reserve is the largest in terms of area among the biosphere reserves listed.

Conclusion

Comparing the areas of the given biosphere reserves, the Gulf of Mannar Biosphere Reserve has the largest total area. This makes it the correct answer to the question.

Revision Table: Biosphere Reserve Areas

Additional Information on Gulf of Mannar Biosphere Reserve

The Gulf of Mannar Biosphere Reserve is located in the Indian Ocean, covering part of the coastal areas of Tamil Nadu and extending into the sea. It is one of the first biosphere reserves established in India (1989) and is globally recognized. Its large area is due to the inclusion of a significant marine component, which is rich in biodiversity, including coral reefs, seagrass beds, and various marine species like dugongs and dolphins. It encompasses 21 islands along the coast.