Question

Consider the following statements:

1. The Brahmaputra River is more flood-prone in Tibet than in Assam.

2. Silt deposition by Brahmaputra is responsible for its braided channels.

3. The river valley in India experiences intense sedimentation due to high rainfall.

• A. 1 & 2 only
• B. 2 & 3 only
• C. 1 & 3 only
• D. All are correct

Answer 1

Answer:

B. 2 & 3 only

• Correct Answer: Option B) 2 & 3 only

• The question relates to characteristics of the Brahmaputra River and its flood patterns.

• The Brahmaputra River is more flood-prone in Tibet than in Assam - This statement is incorrect. The Brahmaputra (known as Tsangpo in Tibet) flows relatively calmly through Tibet as it travels through a high-altitude plateau region. When it enters India (Assam), it descends rapidly from the Himalayas into the plains, where it becomes much more flood-prone due to the significant change in gradient, heavy monsoonal rainfall, and narrower valley. Assam experiences severe flooding almost annually due to the Brahmaputra.

• Silt deposition by Brahmaputra is responsible for its braided channels- This statement is correct. The Brahmaputra carries an enormous sediment load, especially during monsoon season. This high silt deposition creates multiple channels that split and rejoin, forming a braided pattern. The river constantly shifts these channels as it deposits sediment in some areas while eroding others.

• The river valley in India experiences intense sedimentation due to high rainfall- This statement is correct. The Brahmaputra basin in India, particularly in Assam, receives very heavy rainfall (over 2,000 mm annually in many parts). This high precipitation leads to increased erosion in the catchment area, which in turn contributes to the heavy sedimentation in the river valley.