Appearance of brown spots surrounded by chlorotic veins is a toxicity symptom of
A
Mo
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B
Mn
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C
Mg
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D
Zn
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Solution
The correct option is B Mn Micronutrients are always required in low amounts. Their moderate decrease in the soil causes deficiency symptoms. However, a moderate increase in their concentration can cause toxicity as there is a narrow range of concentration at which the elements are optimum. Any mineral ion concentration in tissues that reduces the dry weight of tissues by about ten percent is considered to be toxic concentration. Appearance of brown spots surrounded by chlorotic veins is a toxicity symptom of Mn. Excess of Mn cause: