Excessive use of chemical fertilisers causes shrivelling of the roots and wilting of the plant, because the__________________?
Correct answer: C. Osmotic pressure of the soil water becomes higher than that of the plant sap
- A. Osmotic pressure of the soil water becomes less than that of the plant sap
- B. Soil becomes too alkaline
- C. Osmotic pressure of the soil water becomes higher than that of the plant sap
- D. Soil becomes too acidic
Explanation
Fertiliser salts raise the soil-solution concentration, so its osmotic pressure becomes higher than that of the plant sap. Water then moves out of the roots by osmosis, causing wilting and root shrivelling.
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