Question

The disease resistance in plants is imparted by

• A. K
• B. Mo
• C. Mn
• D. N

Hint:

Remember that Potassium is key to building structural strength and pest resistance. It is the primary nutrient linked with osmotic regulation and stress tolerance in agronomy.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Essential plant nutrients play specific physiological roles in growth, metabolism, and defense mechanisms.
Certain macronutrients help build structural and biochemical barriers against microbial invasions.

Step 2: Detailed Explanation:
Potassium (K) is well-known for its role in regulating stomatal opening and closing, maintaining turgor pressure, and activating over 60 enzymes.
It aids in the synthesis of cellulose and lignin, leading to thicker cell walls that physically prevent pathogen entry.
Moreover, potassium application helps optimize the levels of soluble sugars and amino acids, minimizing the food source available for potential pests and pathogens.
In contrast, excess Nitrogen (N) often leads to lush, succulent vegetative growth, making the plant more susceptible to diseases.

Step 3: Final Answer:
Potassium (K) is the element responsible for imparting disease resistance to plants, matching Option (A).