Question

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

• A. 1 - C, 2 - A, 3 - D, 4 - B
• B. 1 - C, 2 - A, 3 - B, 4 - D
• C. 1 - A, 2 - C, 3 - D, 4 - B
• D. 1 - A, 2 - C, 3 - B, 4 - D

Answer 1

Answer: (D)

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.