A. The entry of pathogen through natural openings
A.
B. Reproduction by pathogen
B.
C. Reducing the quantity of yield
C.
D. Direct penetration of the pathogen
D.
Correct Answer: C
সঠিক উত্তর: C
Explanation
ব্যাখ্যা
"Reducing the quantity of yield" is not a method of perpetuation of disease by a pathogen, but rather a consequence of the disease. Pathogens perpetuate themselves by entering hosts, reproducing, and spreading. Reducing yield is a negative outcome for the host plant caused by the pathogen's infection, not a mechanism by which the pathogen continues to spread.