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Plants die from prolonged water-logging because:

1. soil nutrients become very dilute
2. root respiration stops
3. cell sap in the plants becomes too dilute
4. nutrients leach down due to excess water

Correct answer: root respiration stops

Solution

Waterlogging saturates the soil, so oxygen cannot diffuse to the roots. Without oxygen, root cells cannot carry out aerobic respiration, energy supply fails, and the plant dies.

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