Question

Supply of excess fertilizer and watering of a grass lawn causes browning of grass leaves due to

• A. Decreased photosynthesis
• B. Water-logging of soil
• C. Leaching of fertilizer to lower soil strata
• D. Osmosis and death of root

Answer 1

Answer: (D)

Osmosis and death of root

When fertilizers and water are supplied in excess in grass lawn then the soil solution becomes very much concentrated and in this soil solution, the solvent is in the minimum amount. Due to their concentration gradient, osmosis occurs and roots start to emit water as the result of exosmosis. Due to loss of excess water, root cells die and grass leaves become brownish.

So the correct answer is 'Osmosis and death of root'.