Transcription of CHAPTER 12 INERAL NUTRITION - NCERT
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CHAPTER 12 INERAL NUTRITION - NCERT
194 BIOLOGYThe basic needs of all living organisms are essentially the same. Theyrequire macromolecules, such as carbohydrates, proteins and fats, andwater and minerals for their growth and CHAPTER focusses mainly on inorganic plant NUTRITION , whereinyou will study the methods to identify elements essential to growth anddevelopment of plants and the criteria for establishing the will also study the role of the essential elements, their major deficiencysymptoms and the mechanism of absorption of these essential CHAPTER also introduces you briefly to the significance and themechanism of biological nitrogen TO STUDY THE mineral REQUIREMENTS OF PLANTSIn 1860, Julius von Sachs, a prominent German botanist, demonstrated,for the first time, that plants could be grown to maturity in a definednutrient solution in complete absence of soil. This technique of growingplants in a nutrient solution is known as hydroponics.
calcium and magnesium. Of these, carbon, hydrogen and oxygen are mainly obtained from CO 2 and H 2O, while the others are absorbed from the soil as mineral nutrition. Micronutrients or trace elements, are needed in very small amounts (less than 10 mmole Kg –1 of dry matter). These include iron, manganese,
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