Which one of the following symptoms is not due to manganese toxicity in plants?

1. Calcium translocation in shoot opex is inhibit
2. Deficiency in both iron and nitrogen induced
3. Appearance of brown spot surrounded by chlorotic veins
4. None of the above

Manganese is an essential micronutrient which is mainly required by the leaves and seeds of plants. Manganese becomes toxic when absorbed by plants in higher amounts. Its toxicity cause reduced uptake of Fe2, Mg2+ and N, inhibition of Ca2+ translocation in shoot apex, brown spots surrounded by chlorotic veins etc.
Page 199, XI NCERT