Discussion
Choose the micronutrient needed for plant growth
Answer: D
The micronutrient is zinc.
Micronutrients are essential elements needed by plants in very small amounts, typically less than 10 mg per kg of dry matter: iron, manganese, copper, molybdenum, zinc, boron, chlorine and nickel. Zinc is needed for enzymes and for making the growth hormone auxin; its deficiency causes 'khaira' disease of rice.
Oxygen, hydrogen and nitrogen are macronutrients, required in large amounts; carbon, hydrogen and oxygen form the bulk of plant tissue.
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