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Critical Concentration

Which of the ...

Question

Which of the following statements is incorrect?

A

Below critical concentration, nutrient levels limit plant growth

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B

Beneficial elements include sodium, silicon, cobalt and selenium

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C

Manganese toxicity induces deficiencies of iron and calcium

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D

If there is a deficiency of mobile nutrients, the symptoms are first seen in newer parts of the plant

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Solution

The correct option is D If there is a deficiency of mobile nutrients, the symptoms are first seen in newer parts of the plant
Mobile nutrients - nitrogen, potassium and magnesium. The deficiency symptoms of mobile nutrients are first visible in the senescent (older) leaves.

Immobile nutrients - The deficiency symptoms of immobile nutrients appear first in the young leaves as they are not transported out of the older leaves. For example, calcium.

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Q. Assertion :Deficiency symptoms appear when the availability of the essential nutrients falls below the critical concentration Reason: Critical concentration is that limited concentration of the essential element below which growth of the plant is reduced.

Q. Assertion: Plant exhibits deficiency symptoms
Reason: It receives nutrients below critical concentration

Q. (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.

Q. Which of the following statements are correct?
(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
(iv) Chlorosis is the loss of chlorophyll due to deficiency of N, K, Mg, Fe, S, Mn, Zn, Mo.
(v) Different plants respond differently to the deficiency of the same element.

Q. Select the correct option-
Assertion: When there is a deficiency of relatively mobile elements, the deficiency symptoms appear first in young tissues.
Reason: Relatively mobile elements like nitrogen, phosphorus etc are transported from young tissues to old senescing tissues

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