(a) Moderate decrease of increase on micronutrients causes deficiency and toxicaity symptoms respectively.
(b) Excess of manganese causes toxicity of iron calcium and molybdenum.
(c ) A macronutrients said to be toxic when present below a critical concentration.

Assertion :- Moderate decrease of micronutrients causes the deficiency symptoms and moderate increase causes toxicity. Reason:- There is a narrow range of concentration at which micronutrients are optimum.

(i) The deficiency of any element can cause multiple symptoms. (ii) Same symptoms may be caused by the deficiency of one or several different elements. (iii) The concentration of the essential element below which plant growth is retarded is termed as critical concentration. Chlorosis is the loss of chlorophyll due to deficiency of N, K, Mg, Fe, S, Mn, Zn Mo. Different plants respond differently to the deficiency of the same element. How many of the above statement are correct?

Assertion: The prominent symptom of manganese toxicity is the appearance of brown spots surrounded by chlorotic veins. Reason: Excess of maganese may induce deficiencies of iron, magnesium and calcium.

Assertion: The prominent symptom of manganese toxicity is the appearance of brown spots surrounded by chlorotic veins. Reason: Excess of maganese may induce deficiencies of iron, magnesium and calcium.

Assertion: The prominent symptom of manganese toxicity is the appearance of brown spots surrounded by chlorotic veins. Reason: Excess of maganese may induce deficiencies of iron, magnesium and calcium.

Assertion: The prominent symptom of manganese toxicity is the appearance of brown spots surrounded by chlorotic veins. Reason: Excess of maganese may induce deficiencies of iron, magnesium and calcium.