Question:

Necrosis in crops is due to the deficiency of

  • Ca, K, S and Mo
  • N, K, S and Mo
  • N.S. Fe and Zn
  • Mg, S, Mn and Ca
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The Correct Option is A

Solution and Explanation

Deficiency of sulphur leads to
(i) chlorosis followed by necrosis
(ii) change in pigmentation Deficiency of calcium leads to
(i) stunted growth
(ii) chlorosis
(iii) necrosis and curling Deficiency of potassium leads to
(i) chlorosis followed by necrosis
(ii) widespread blackening. Deficiency of molybdenum leads to
(i) marginal necrosis (ii) whiptail disease
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Concepts Used:

Essential Mineral Elements

Mineral Elements:

A large number of inorganic elements are necessary for all the life processes and hence should be taken into our diets in adequate amounts. Any deficiency in these minerals leads to an abnormality in the metabolic functioning of the body.

Essential Mineral Elements in Plants

There are two types of minerals that are essential for plant growth, such as:

1. Macrominerals

Minerals like Phosphorous, carbon, silicon, magnesium, hydrogen, sodium, nitrogen, potassium, calcium, oxygen, selenium, and sulfur are required in abundance for proper plant growth and are also found abundantly in plant tissues. Hence, they are known as macrominerals.

2. Microminerals

A few minerals like Iron, boron, zinc, cobalt, chlorine, nickel, manganese, copper, molybdenum, etc. are required in lesser quantities for proper growth by the plants and therefore, they are called microminerals. Further they are also called trace elements.