(B) When the soil is waterlogged,the air spaces in the soil are filled with water,which prevents the roots from obtaining oxygen. Since roots require

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Respiration by roots is stopped.

(B) When the soil is waterlogged,the air spaces in the soil are filled with water,which prevents the roots from obtaining oxygen. Since roots require oxygen for aerobic respiration to generate energy for nutrient uptake,the lack of oxygen leads to the death of the root cells and eventually the plant.