Concept notes: The Purvanchal hills are a series of hill ranges located in the northeastern part of India. They include the Patkai, Mizo, and Naga hills, which are significant geographical features of the region. These hills are part of the easternmost extension of the Himalayan mountain system and play a crucial role in the region's climate and biodiversity.
Explanation: The Purvanchal hills are a significant geographical feature in the northeastern part of India. They are a series of hill ranges that form the easternmost extension of the Himalayan mountain system. The term "Purvanchal" refers to the eastern region, and these hills are a collective term for several hill ranges in this area.
The Purvanchal hills include the Patkai, Mizo, and Naga hills. The Patkai hills are located in the northeastern part of India and form a significant portion of the eastern boundary of the country. They are an important geographical feature that influences the climate and biodiversity of the region. The Mizo hills are located in the state of Mizoram and are another significant part of the Purvanchal hills. They are known for their rich biodiversity and unique cultural heritage. The Naga hills are situated in the state of Nagaland and are a crucial part of the northeastern hill ranges. They are known for their rugged terrain and diverse flora and fauna.
These hill ranges are not only important from a geographical perspective but also play a significant role in the cultural and ecological landscape of the northeastern region of India. They are home to various indigenous communities and are rich in natural resources. The Purvanchal hills are a testament to the diverse and complex topography of India, showcasing the country's rich geographical diversity.
In conclusion, the Purvanchal hills are comprised of the Patkai, Mizo, and Naga hills, making option D the correct answer. Understanding the geographical features of the northeastern region of India is crucial for comprehending the region's cultural, ecological, and economic significance.