Question

Among the following, deficiency of how many macronutrients cause necrosis?

• A. Ca, Mg, Cu and K
• B. N, Fe, Mn and Ca
• C. Mg, S, Mo and K
• D. Zn, Cu, Mn and Mg

Answer 1

The correct option is A

Ca, Mg, Cu and K

The correct option is A:

Explanation of the correct option:

1. Cell damage causes necrosis, which causes cells in live tissue to die prematurely.
2. Necrosis is caused by a lack of Cu, K, Ca, and Mg.

Explanation of the incorrect option:

Option B:

Chlorosis is caused by a lack of Fe and Mn, whereas a lack of N causes flowering to be delayed.

Option C:

Mo, K, and S deficit restrict cell division, and K and S deficiency also causes chlorosis.

Option D:

Chlorosis is caused by a lack of Zn, Cu, Mn, and Mg, and necrosis is caused by a lack of Mg.

Final answer: Deficiency of Ca, Mg, Cu, and K causes necrosis.