Question

Which one of the following symptoms is not due to
manganese toxicity in plants?
(a) Calcium translocation in shoot opex is inhibit
(b) Deficiency in both iron and nitrogen induced
(C) Appearance of brown spot surrounded by chlorotic veins
(d) None of the above​

Answer 1

Manganese toxicity also frequently causes chlorosis (pale or yellow colour), most severe on the younger leaves, due to an induced iron deficiency. Either one or both of these symptoms may be observed in crops affected by manganese toxicity. So, the correct answer is "Deficiency in both iron and nitrogen is induced.".....

Answer 2

The answer is :

B (deficiency in both iron and nitrogen)

The reason is :

The prominent symptom of manganese toxicity is the appearance of brown spot surrounded by chlorotic veins. It is important to know that manganese competes with iron and magnesium for uptake and with magnesium for binding with enzymes. Manganese also inhibits calcium translocation in shoot apex. therefore, excess of manganese may, in fact, induce deficiencies of iron, magnesium and calcium.