With reference to the North-Eastern hills, consider the following pairs: Hills/ Ranges Features 1. Assam Himalayas The southern slope is very steep. 2. Gorichen Peak The highest peak of Assam. 3. The Garo Hills Home to the most famous limestone caves of Siju. 4. The Jampui hills Blue mountain is the highest peak. Choose the correctly matched pairs using the codes given below:

The correct answer is 1 and 3 only. Key Points Assam Himalayas : Extends in Sikkim, Arunachal Pradesh, Bhutan & Tibet Autonomous Region. ​Its Southern slope is very steep. Hence, pair 1 is correctly matched. In the West, its steep decreases gradually . Peaks like Namcha Barwa, Kula, Chomo & Kangto, etc are located in the Himalayas. Namcha Barwa is the highest mountain peak of the Assam Himalaya range. Rivers: Subansiri, Manas, Sankosh, Raidak & Jaldhaka etc. Purvanchal Ranges: The Patkai mountain range is also known as Purvanchal Range. Patkai Range consists of the three major hills, the Patkai-Bum, the Garo-Khasi-Jaintia, and Lushai Hills. Most of the part of Arunachal Pradesh is covered by the great Himalayas and the rest of the part is by the Patkai hills. Gorichen Peak is the highest Himalayan peak in the region, located between the Tawang and West Kameng district of Arunachal Pradesh. It is the highest peak of Arunachal Pradesh. Hence, pair 2 is not correctly matched. The Lushai Hills (Mizo Hills) is located partially in Mizoram and Tripura. Blue mountain is the highest peak of Lushai Hills. Hence, pair 4 is not correctly matched. Mizo Hills is highly covered with dense bamboo jungle and open grass-covered slopes. The Garo Hills is located in Meghalaya state and part of the Garo-Khasi range , Nokrek Peak is the highest peak of Garo Hills. It is home to the most famous limestone caves of Siju, one of the longest in Asia. Hence, pair 3 is correctly matched. ​ ​ ​The Jampui hill ranges: It is located in the state of Tripura (North Tripura District). The predominant tribes inhabiting the hills are Lushais and Readings . It is famous for its unique Orange Festival , view of rising and setting sun, etc. The highest peak of Tripura Betlingchhip (3600 feet), falls in this hill range.