Phase of Maximum Bacterial Multiplication

Multiplication of bacteria is highest during:

Correct Answer: Log Phase

Bacterial multiplication (cell division) is highest during the Log phase (also called the Exponential phase or Logarithmic growth phase).

Four Phases of Bacterial Growth

• Lag phase — Adaptation period; cells increase in size but do not divide. No increase in cell numbers. Duration depends on age of culture and environmental conditions.
• Log phase (Exponential phase) — Cells divide at maximum rate (generation time is constant and at minimum). Highest multiplication.
• Stationary phase — Cell division = cell death rate. Total viable count remains constant. Nutrients depleted; toxic metabolites accumulate.
• Decline phase (Death phase) — Cell death exceeds new cell formation. Total count falls.

Practical Significance in Meat Preservation

• Preservation methods aim to prolong the lag phase of bacterial growth — by chilling, vacuum packaging, adding preservatives. The longer the lag phase, the greater the shelf life.