Question

Select the correct match for deficiency disease.

Mineral	Diseases
A. N	1. Coppery texture of leaf
B. Mg	2. Premature leaf fall
C. B	3. Interveinal chlorosis
D. P	4. Mottled chlorosis and necrosis

• A. A- 1, B- 2, C- 3, D- 4
• B. A- 4, B- 2, C- 1, D- 3
• C. A- 4, B- 3, C- 1, D- 2
• D. A- 4, B- 1, C- 2, D- 3

Answer 1

The correct option is C A- 4, B- 3, C- 1, D- 2

Nitrogen is required in the largest quantity. Its deficiency leads to chlorosis and necrosis. As the deficiency progresses older leaves become uniformly yellow (chlorotic). Leaves approach a yellowish-white colour under extreme deficiency.

The magnesium deficient leaves show advanced interveinal chlorosis, with necrosis developing in the highly chlorotic tissue.

In boron deficiency, the leaf blades develop a pronounced crinkling and there is a darkening and crackling of the petioles often with exudation of syrupy material from the leaf blade. The leaves are unusually brittle and tend to break easily. They develop coppery texture.

As a rule, phosphorus deficiency symptoms are not very distinct and thus difficult to identify. A major visual symptom is that the plants are dwarfed or stunted due to premature leaf fall.