Q.53 Match the pathogen, disease caused and the affected plant in the CORRECT combination.
Pathogen
P. Blumeria graminis
Q. Magnaporthe grisea
R. Venturia inaequalis
S. Cercospora personata
Disease
i. Blast disease
ii. Powdery mildew
iii. Tikka disease
iv. Scab disease
Plant
1. Groundnut
2. Apple
3. Barley
4. Rice
(A) P-i-1, Q-ii-2, R-iii-3, S-iv-4
(B) P-i-2, Q-ii-1, R-iii-4, S-iv-3
(C) P-ii-3, Q-i-4, R-iv-2, S-iii-1
(D) P-ii-3, Q-i-4, R-iii-2, S-iv-1
Blumeria graminis causes powdery mildew on barley, while Magnaporthe grisea leads to blast disease in rice. This MCQ tests key associations in plant pathology relevant for agriculture exams and crop protection strategies.
Correct Answer
Option (C) P-ii-3, Q-i-4, R-iv-2, S-iii-1 matches correctly: P (Blumeria graminis) with ii (Powdery mildew) on 3 (Barley); Q (Magnaporthe grisea) with i (Blast disease) on 4 (Rice); R (Venturia inaequalis) with iv (Scab disease) on 2 (Apple); S (Cercospora personata) with iii (Tikka disease) on 1 (Groundnut).
These pairings align with standard plant pathology references, where each pathogen targets specific hosts and produces distinct symptoms like white powdery growth or leaf spots.
Pathogen-Disease-Plant Matches
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Blumeria graminis: Triggers powdery mildew (ii) on barley (3), showing white fungal patches on leaves that reduce photosynthesis.
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Magnaporthe grisea: Causes blast disease (i) in rice (4), leading to lesions on leaves and panicles that devastate yields.
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Venturia inaequalis: Responsible for scab disease (iv) on apple (2), forming olive-green spots on fruits and leaves.
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Cercospora personata: Induces Tikka disease (iii) in groundnut (1), with dark leaf spots that mimic tikka marks.
Option Analysis
Option (A) P-i-1, Q-ii-2, R-iii-3, S-iv-4: Incorrect. Mismatches blast (i) to groundnut (1) instead of rice, and powdery mildew (ii) to apple (2) rather than barley.
Option (B) P-i-2, Q-ii-1, R-iii-4, S-iv-3: Incorrect. Assigns blast (i) to apple (2) wrongly and Tikka (iii) to rice (4), ignoring standard hosts like barley for powdery mildew.
Option (C) P-ii-3, Q-i-4, R-iv-2, S-iii-1: Correct, as detailed above with precise pathogen-host-disease links confirmed in agronomy sources.
Option (D) P-ii-3, Q-i-4, R-iii-2, S-iv-1: Incorrect. Wrongly pairs scab (iv) with groundnut (1) and Tikka (iii) with apple (2), swapping Venturia and Cercospora effects.
Exam Preparation Tips
Understand these associations through symptom recognition: powdery mildew’s white coating versus blast’s spindle lesions. Practice similar MCQs for competitive exams in biotechnology and agriculture to master plant pathology fundamentals.
