Why Are Micronutrients Needed in Only Very Small Amounts

Multiple Choice

Why are micronutrients needed in only very small amounts?

A) most micronutrients are mobile in the plant
B) most micronutrients serve mainly as cofactors of enzymes
C) micronutrients play only a minor role in the growth and health of the plant
D) only the most actively growing regions of the plants require micronutrients