Match the column - I with column - II - Column – I Column – II 1. Micronutrients A. Fe 2. Macronutrients B. Nitrosomonas 3. Nitrification C. S 4. Denitrification D. Thiobacillus

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Match the column - I with column - II - Column – I Column – II 1. Micronutrients A. Fe 2. Macronutrients B. Nitrosomonas 3. Nitrification C. S 4. Denitrification D. Thiobacillus, 1 - C, 2 - A, 3 - D, 4 - B, 1 - C, 2 - A, 3 - B, 4 - D, 1 - A, 2 - C, 3 - D, 4 - B, 1 - A, 2 - C, 3 - B, 4 - D

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Macronutrients Micronutrients or Trace Elements Examples : Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorus, Sulphur, Potassium, Calcium and Magnesium. Examples : Iron, Manganese, Copper, Molybdenum, Zinc, Boron, Chlorine and Nickel. Following steps are involved in nitrification : 1 . Oxidation of ammonia to nitrite (by Bacteria - Nitrosomonas and/or Nitrococcus ) 2 . Further oxidation of nitrite to nitrate (by Bacteria - Nitrobacter ) Denitrification: Some bacteria such as Thiobacillus denitrificans, Pseudomonas aoruginosa and Micrococcus denitrificans also occur in the soil which convert the nitrate and ammonia into atmospheric free elemental nitrogen.

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	Column – I		Column – II
1.	Micronutrients	A.	Fe
2.	Macronutrients	B.	Nitrosomonas
3.	Nitrification	C.	S
4.	Denitrification	D.	Thiobacillus

Macronutrients	Micronutrients or Trace Elements
Examples : Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorus, Sulphur, Potassium, Calcium and Magnesium.	Examples : Iron, Manganese, Copper, Molybdenum, Zinc, Boron, Chlorine and Nickel.