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Question

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

A
Only (a) is correct
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B
Only (b) is correct
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C
(b) and (c) are correct
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D
(a) and (c) are correct
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Solution

The correct option is A Only (a) is correct
A macronutrient is said to be toxic when present above a critical concentration. Moderate decrease of micronutrients causes deficiency in plants and excessive intake of minerals or micronutrient causes toxicity. Excess of manganese causes deficiencies of iron, calcium and molybdenum.

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