Notes On Micronutrients of Plants - CBSE Class 11 Biology
The elements that are required in minute quantities by plants such as iron, manganese, copper, molybdenum, zinc, boron, chlorine and nickel are called micronutrients or trace elements. Micronutrients occur as the constituents of several enzymes that catalyze biological reactions. Any mineral ion concentration in tissues that reduces their dry weight by about 10 percent is considered toxic. The excess concentration of an element, affects the uptake of another element. The elements that are required in minute quantities by plants, such as iron, manganese, copper, molybdenum, zinc, boron, chlorine and nickel are also called as micronutrients or trace elements. Micronutrients occur as constituents of several enzymes that catalyze biological reactions. Iron is made available to the plants taken in by the plants in the form of ferric ions. Deficiency symptoms include chlorosis in younger leaves inhibition of chloroplast formation, and necrosis. Manganese is absorbed in the form of manganous ions. Deficiency symptoms include chlorosis, occurrence of grey spots on leaves, poor development of root system. Plants obtain the trace element zinc as Zn2+ ions. Deficiency symptoms include chlorosis, reduction in fruits and seeds, formation of smaller leaves and shortened internodes. Copper absorbed from the soil as Cu2+. Deficiency symptoms include decrease in absorption of carbon dioxide, chlorosis of leaves followed by  necrosis. The trace element boron is absorbed as boride ions.  Chlorine is absorbed in the form of chloride anion. Deficiency symptoms include the shortening of roots, and wilting of leaves. Nickel is absorbed in the form of Ni2+. Deficiency of nickel leads to the failure in production of viable seeds. Any mineral ion concentration in tissues that reduces the dry weight of tissues by about 10 per cent is considered toxic.

Summary

The elements that are required in minute quantities by plants such as iron, manganese, copper, molybdenum, zinc, boron, chlorine and nickel are called micronutrients or trace elements. Micronutrients occur as the constituents of several enzymes that catalyze biological reactions. Any mineral ion concentration in tissues that reduces their dry weight by about 10 percent is considered toxic. The excess concentration of an element, affects the uptake of another element. The elements that are required in minute quantities by plants, such as iron, manganese, copper, molybdenum, zinc, boron, chlorine and nickel are also called as micronutrients or trace elements. Micronutrients occur as constituents of several enzymes that catalyze biological reactions. Iron is made available to the plants taken in by the plants in the form of ferric ions. Deficiency symptoms include chlorosis in younger leaves inhibition of chloroplast formation, and necrosis. Manganese is absorbed in the form of manganous ions. Deficiency symptoms include chlorosis, occurrence of grey spots on leaves, poor development of root system. Plants obtain the trace element zinc as Zn2+ ions. Deficiency symptoms include chlorosis, reduction in fruits and seeds, formation of smaller leaves and shortened internodes. Copper absorbed from the soil as Cu2+. Deficiency symptoms include decrease in absorption of carbon dioxide, chlorosis of leaves followed by  necrosis. The trace element boron is absorbed as boride ions.  Chlorine is absorbed in the form of chloride anion. Deficiency symptoms include the shortening of roots, and wilting of leaves. Nickel is absorbed in the form of Ni2+. Deficiency of nickel leads to the failure in production of viable seeds. Any mineral ion concentration in tissues that reduces the dry weight of tissues by about 10 per cent is considered toxic.

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