Consider the following statements:

1. Asiatic lion is naturally found in India only.

2. Double-humped camel is naturally found in India only.

3. One-horned rhinoceros is naturally found in India only.

Which of the statements given above is/are correct?

The correct option is 1 only.

Let us analyze each of the given statements step-by-step to understand the natural habitat and distribution of these species:

1. Asiatic lion is naturally found in India only.
This statement is correct.
The Asiatic lion (Panthera leo persica) was historically widespread across Southwest Asia and India. However, today, its wild population is entirely restricted to Gir National Park and Wildlife Sanctuary and its surrounding areas in Gujarat, India. Therefore, India is the only country where the Asiatic lion is naturally found in the wild.

2. Double-humped camel is naturally found in India only.
This statement is incorrect.
The double-humped camel (Bactrian camel) is native to the cold deserts of Central Asia, including regions across Mongolia, China, Kazakhstan, Turkmenistan, and Uzbekistan. While a small population of domesticated double-humped camels exists in the Nubra Valley of Ladakh, India, they are not endemic or naturally restricted to India only.

3. One-horned rhinoceros is naturally found in India only.
This statement is incorrect.
The Greater One-horned Rhinoceros (Rhinoceros unicornis) is native to the Indian subcontinent. While the vast majority of its population is conserved in India (primarily in Kaziranga National Park, Assam), wild populations are also naturally found in Nepal (such as in Chitwan National Park).

Conclusion:
Since only statement 1 is correct, the right choice is 1 only.