Question

Match List I with List II: 

List I (Disease)	List II (Pathogen)
A. Root rot of cotton	I. Pythium myriotylum
B. Rhizome rot of ginger	II. Rosellinia necatrix
C. Root rot of apple	III. Rhizoctonia bataticola
D. Black scurf of potato	IV. Rhizoctonia solani

Choose the correct answer from the options given below:

• A. A-II, B-III, C-IV, D-I
• B. A-IV, B-II, C-I, D-III
• C. A-III, B-I, C-II, D-IV
• D. A-I, B-III, C-II, D-IV

Hint:

In pathology questions, associate Rhizoctonia solani almost exclusively with "Black Scurf" in potatoes and "Sheath Blight" in rice.
Pythium is usually associated with "Damping off" and soft rots.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Plant diseases are caused by specific fungal pathogens, and matching them requires knowledge of plant pathology.

Step 3: Detailed Explanation:
1. Root rot of cotton (A): Caused by Rhizoctonia bataticola (also known as Macrophomina phaseolina). It leads to sudden wilting and drying of plants. (Matches III).
2. Rhizome rot of ginger (B): Primarily caused by Pythium myriotylum. This is a soil-borne water mold that causes soft rot of the rhizomes. (Matches I).
3. Root rot of apple (C): Specifically, white root rot is caused by Rosellinia necatrix. It causes a cottony white growth on the root surface. (Matches II).
4. Black scurf of potato (D): Caused by Rhizoctonia solani. It is characterized by black sclerotia on the tuber surface which do not wash off. (Matches IV).

Step 4: Final Answer:
Matching the pairs: A-III, B-I, C-II, D-IV. This corresponds to Option (C).