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प्रश्न
Explain the term eutrophication with suitable example
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उत्तर
Eutrophication refers to alteration in the life of aquatic ecosystem due to increase in the concentration of certain organic compounds such as nitrates and phosphates. This generally occurs when fertilisers from a field are washed off by rainwater or irrigation to nearby ponds or rivers.
Example: Sudden increase in the population of algae or phytoplanktons in water body due to increase in the level of nutrients in water.
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संबंधित प्रश्न
Compare the use of manure and fertilizers in maintaining soil fertility.
Classify nutrients according to their sources.
Choose plant’s micronutrients and macronutrients from the following Iron, Chlorine, Sulphur, Copper, Nitrogen, Calcium, Manganese, Potassium, Zinc, Magnesium, Molybdenum, Phosphorus.
During the downpour in a village, the rain water carried away excess of nitrogenous and other compounds present in the soil to a pond. How will they affect the growth of algae and phytoplankton in the pond ?
How does excessive irrigation lead to soil salinity ?
Why water should be used judiciously ?
Why are leguminous crops desirable in crop rotation?
Classify plant diseases depending upon their occurrence and transmission.
Explain various effects of weeds on crop plants.
Discuss the various methods which are used to control plant diseases.
