AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
(B) Rockier stream beds that reduce suitable habitats for aquatic life
Excessive sedimentation causes poor sediment flow, resulting in rockier stream beds and poorer habitats for aquatic life.
The source passage directly states: "Regulating and damming of rivers affect their natural flow causing poor sediment flow and excessive sedimentation at the bottom of the reservoir, resulting in rockier stream beds and poorer habitats for the rivers' aquatic life." Options C and D are the opposite of what dams cause — silt is actually deprived from flood plains, and fish migration becomes more difficult, not easier. Option A is also incorrect as downstream flow is reduced, not increased.