Explanations:The Brahmaputra Basin is a significant geographical region in northeastern India, characterized by the flow of the Brahmaputra River. The Brahmaputra River originates in Tibet and enters India through the state of Arunachal Pradesh. It then flows through the state of Assam, which is a major part of the Brahmaputra Basin. The river continues its course and eventually flows into Bangladesh, but its basin extends into parts of other northeastern Indian states as well.
Among the northeastern states, Assam is the most prominent part of the Brahmaputra Basin. The river flows through the entire length of Assam, making it a crucial part of the basin. However, the basin also extends into parts of other states, including Tripura. Tripura, while not directly through which the Brahmaputra River flows, is still part of the Brahmaputra Basin due to its geographical proximity and the influence of the river's tributaries and distributaries.
Other northeastern states like Manipur, Nagaland, and Mizoram are not part of the Brahmaputra Basin. These states are located in different geographical regions and are influenced by other river systems. For example, Manipur is part of the Barak River Basin, while Nagaland and Mizoram are influenced by various smaller river systems.
Understanding the geographical extent of the Brahmaputra Basin is important for comprehending the hydrological and ecological characteristics of northeastern India. The basin is known for its rich biodiversity, fertile alluvial soils, and significant agricultural productivity. It also plays a crucial role in the socio-economic development of the region, providing water resources for irrigation, hydroelectric power, and transportation.
Therefore, the correct answer is that the Brahmaputra Basin covers the states of Assam and Tripura. This reflects the geographical reality of the river's flow and the basin's extension into these states.