Explanation:

Only statements 1,2&3 are correct.

• It is situated on the border of Kerala and Tamil Nadu in the north where it extends as the Annamalai National Park.

• Eravikulam National Park situated along the summit of the Western Ghats in the high ranges of Idduki district of Kerala.

• This is also the land of "Neelakurinji", a flower that blooms once in twelve years.

• The Park is breathtakingly beautiful and is easily comparable to the best of mountain ranges in the Alps.

• It is the natural habitat of Nilgiri tahr in Munnar.

• Eravikulam National Park (ENP) has a new attraction — a Fernarium set up inside the park. This is the first time such a fern collection has been established in the hill station.

• Ferns are part of the Epiphytic family.

• They grow naturally in a soilless condition. The plants obtain water and nutrients through leaching from trees. A large number of ferns are on the trees inside the park.

Hence option 3rd is correct.