WAEC Agriculture 2011 Paper

Concept:Micro-nutrients are essential elements that plants need only in trace or very small amounts for healthy growth and metabolism.Explanation:Plant nutrients are grouped into two main categories.Macro-nutrients are required in large quantities.Micro-nutrients are needed in very small quantities.Important micro-nutrients include iron ($\mathrm{Fe}$), zinc ($\mathrm{Zn}$), copper ($\mathrm{Cu}$), manganese ($\mathrm{Mn}$), and boron ($\mathrm{B}$).These elements help in enzyme activation and various metabolic processes.Micro-nutrients do not mainly promote the formation of root nodules.They are not generally fixed into the soil through microbial activity.They are not primarily responsible for increasing crop tolerance to pest attack.Therefore, the correct statement is that they are required by plants in very small quantities.Answer:They are required by plants in very small quantities.