Question

Arrange the sequence of events occurring in plant disease cycle. A. Disease development and spread, B. Inoculum, C. Latent phase, D. Infection on plant, E. Appearance of symptoms.

• A. B, D, C, E, A
• B. B, A, C, E, D
• C. A, B, E, C, D
• D. E, B, D, A, C

Hint:

Disease cycle sequence is: inoculum, infection, latent phase, symptoms, and disease development or spread.

Answer 1

The Correct Option is A

Concept:
The plant disease cycle explains how a pathogen starts infection, develops inside the host, produces symptoms, and spreads further.

Step 1: Inoculum.
The disease cycle starts with inoculum. Inoculum is the pathogen material capable of causing infection. \[ \text{First step}=B \]

Step 2: Infection on plant.
After inoculum reaches the suitable host, infection begins. \[ \text{Second step}=D \]

Step 3: Latent phase.
After infection, the pathogen develops inside the plant without visible symptoms. This is the latent phase. \[ \text{Third step}=C \]

Step 4: Appearance of symptoms.
After the latent period, symptoms appear on the plant. \[ \text{Fourth step}=E \]

Step 5: Disease development and spread.
Finally, disease develops further and spreads to other plants. \[ \text{Fifth step}=A \] Thus, the correct sequence is: \[ B,D,C,E,A \] \[ \therefore \text{Correct Answer is (A)} \]