Question

Match List-I with List-II
{ll} List-I (Plant disease) & List-II (Nutrient deficiency)
(A) Grey speck in oats & (I) O2
(B) Black heart in potato & (II) Mn
(C) Blossom end rot & (III) Fe
(D) Chlorosis in rice & (IV) Ca

Choose the correct answer from the options given below:

• (A) - (II), (B) - (III), (C) - (I), (D) - (IV)
• (A) - (II), (B) - (I), (C) - (IV), (D) - (III)
• (A) - (IV), (B) - (II), (C) - (I), (D) - (III)
• (A) - (IV), (B) - (III), (C) - (II), (D) - (I)

Hint:

- Calcium is highly immobile in plants, so calcium deficiency disorders (like blossom end rot in tomato) affect young, rapidly growing tissues.
- Black heart of potato is physical/respiratory rather than nutritional, caused by poor ventilation during storage.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Plants can develop non-parasitic physiological disorders due to deficient nutrient supply or unfavorable storage conditions.

Step 2: Detailed Explanation:
Let us match each plant disorder with its correct deficiency or physiological cause:
- (A) Grey speck in oats:
This is a physiological disorder caused by Manganese (Mn) deficiency. It manifests as greyish-brown spots or streaks on leaf blades.
Thus, (A) matches with (II).
- (B) Black heart in potato:
This is a post-harvest physiological disorder caused by an Oxygen ($O_{2}$) deficiency in the interior of the tuber during storage or transport, particularly under high temperatures. Tuber tissue undergoes asphyxiation and turns black.
Thus, (B) matches with (I).
- (C) Blossom end rot:
This is a common physiological disorder in tomatoes and peppers caused by a localized Calcium (Ca) deficiency. A lack of calcium weakens cell walls at the blossom end of the fruit, causing water-soaked spots that turn into black, leathery lesions.
Thus, (C) matches with (IV).
- (D) Chlorosis in rice:
Iron (Fe) deficiency chlorosis is common in nursery beds, especially in alkaline, calcareous, or sandy soils. It results in a loss of chlorophyll, causing interveinal yellowing.
Thus, (D) matches with (III).
Matching summary:
(A) $\rightarrow$ (II), (B) $\rightarrow$ (I), (C) $\rightarrow$ (IV), (D) $\rightarrow$ (III).

Step 3: Final Answer:
The correct option is (B).