Mineral Nutrition Test - 5

The nutrient required in larger quantity is called macronutrients. Those essential elements which occur in 1-10mg/g quantity is called macronutrients.

Sodium and Iodine minerals are not needed by the majority of plants but sodium and iodine minerals are very much needed by almost all animals. Sodium play important role in nervous system and iodine for synthesis thyroxine hormone.

During ammonification process involve conversion of nitrate into ammonia. This process involves two steps. Second steps require electron that is donated by Ferredoxin.

Rice field contains large number of nitrogen fixing algae and bacteria. In which Aulosira fertilissima is most active nitrogen fixer in the rice field.

Mineral deficiency in soil may be due to use of high yielding varieties, non-rotation of crops and leeching of minerals. Growing leguminous plants do not deplete the mineral in soil.

Amides are obtained from the replacement of –OH component of carboxylic group of amino acid by another amino group.

Mineral absorption into the plant is always against the concentration gradient and use ATP molecules as source of energy is an active process. As concentration of minerals are always higher in cell than soil.

During nitrogen fixation atmospheric nitrogen is converted into nitrates and nitrites. When deficiency of nitrate occurs in soil, nitrogen fixation occurs. So, nitrate deficiency is prerequisite for nitrogen fixation.

Mineral salts are translocated through xylem along with the ascending stream of water, which is pulled up through the plant by transpirational pull.

During biological nitrogen fixation in root nodules of legumes, laghaemoglobin provide protection to the nitrogenase from Oxygen.