Correct option is A
Statement B (Correct) –
Meanders migrate laterally across the floodplain, causing erosion on the outer bank and deposition on the inner bank.
This lateral movement expands the meander belt over time.
Statement C (Correct) –
Oxbow lakes form when a meander loop becomes exaggerated and is eventually cut off from the main river due to deposition.
Statement D (Correct) –
Entrenched or Ingrown Meanders occur when a river experiences uplift or increased downcutting, leading to deep, steep-walled meanders.
Thus, the correct answer is B, C & D Only
Information Booster
1. Causes of Meander Formation & Migration:
- Helicoidal flow (spiral movement of water)
- Lateral erosion on outer banks
- Deposition on inner banks
- Changes in sediment load and water velocity
2. Types of Meanders:
- Free Meanders: Found in alluvial plains, migrate actively.
- Entrenched Meanders: Cut deep into bedrock due to uplift.
- Ingrown Meanders: Asymmetrical, with one steep side due to differential erosion.
Additional Knowledge:
Statement A (Incorrect) –
- Meanders do not migrate upstream; rather, they migrate laterally due to erosion and deposition.
- River cliffs form on the outer bends due to erosion, but this does not lead to upstream movement of meanders.
English
10 Questions
20 Marks
12 Mins
