Question

The sigmoid growth curve has four phases.Choose the correct sequence in which it occurs

• A. (i) Log phase., (ii) Lag phase.,(iii) Stationary phase.,(iv) Death phase
• B. (i) Stationary phase.,(ii) Log phase.,(iii) Lag phase.,(iv) Death phase
• C. (i) Lag phase.,(ii) Log phase.,(iii) Stationary phase.,(iv) Death phase
• D. (i) Lag phase.,(ii) Stationary phase.,(iii) Log phase.,(iv) Death phase

Answer 1

The correct option is C (i) Lag phase.,(ii) Log phase.,(iii) Stationary phase.,(iv) Death phase

4 phases of growth curve

(i) Lag phase – Initial phase of slow growth.

(ii) Log phase – Number of individuals increases at an logarithmic rate.

(iii) Stationary – growth rate and death rate are equal.

(iv) Death phase – Death rate is higher than growth phase and the population curve drops.