Question

In case of resistance, the rate of reproduction of a plant pathogen will be:

• A. \(r=0\)
• B. \(r=1\)
• C. \(r=0-1\)
• D. \(r>1\)

Hint:

Resistance reduces pathogen multiplication, so the reproduction rate remains below \(1\).

Answer 1

The Correct Option is C

Concept:
Resistance in plants reduces the ability of a pathogen to multiply and spread. The reproduction rate of pathogen is represented by \(r\).

Step 1: Understand pathogen reproduction rate.
If pathogen reproduction rate is high, the disease spreads quickly. \[ r>1 \Rightarrow \text{pathogen population increases} \] If pathogen reproduction rate is low, disease development becomes slow. \[ 0<r<1 \Rightarrow \text{pathogen multiplication is reduced} \]

Step 2: Effect of resistance.
A resistant plant does not allow the pathogen to multiply freely. Therefore, pathogen reproduction is suppressed.

Step 3: Choose correct range.
In resistance, the rate is reduced and remains between \(0\) and \(1\). \[ r=0-1 \] \[ \therefore \text{Correct Answer is (C)} \]