Question

What do you mean by toxicity of micronutrients ?

Answer 1

Heya @user
Here is your answer

The requirement of micronutrients is always low amount while there moderate decrease cause the deficiency symptoms and moderate increases cause toxicity

• any mineral Ion concentration in tissue that reduce the weight of tissue by about 10% is considered toxic. such Critical concentration vary widely among different micronutrients.

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Answer 2

NCERT based Answer for Class 11 Biology Students

Toxicity of micronutrients:

 Moderate decrease of micronutrients causes deficiency symptoms and moderate increase causes toxicity.

 Thus, there is narrow range of concentration at which the elements are optimum.

  Any mineral ion concentration in plant that reduces the dry weight of tissue by about 10 percent is considered toxic.

 Excess of an element may inhibit uptake of another element.

 Manganese competes with iron and magnesium for uptake and with Mg for binding with enzymes. Mn also inhibits calcium translocation in shoot apex.

  Thus, excess of Mn induces deficiencies of Fe, Mg and Ca that cause appearance of brown spots surrounded by chlorotic veins.

 Hence, what appear as symptoms of Mn toxicity is actually the deficiency symptoms of Fe, Mg and Ca.

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