The number of death and birth in the last stage of sigmoid growth curve of a population will be
(a) Similar to lag phase
(b) Unequal with more deaths
(c) Unequal with less deaths
(d) Equal

Options

A. Similar to lag phase
B. Unequal with more deaths
C. Unequal with less deaths
D. Equal

Answer

To solve the question regarding the number of deaths and births in the last stage of the sigmoid growth curve of a population, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Sigmoid Growth Curve**:
- The sigmoid growth curve consists of four phases: lag phase, exponential (log) phase, transitional phase, and plateau phase. Each phase has distinct characteristics regarding population growth.

2. **Identify the Last Stage**:
- The last stage of the sigmoid growth curve is the plateau phase. This is where the population growth levels off.

3. **Analyze the Plateau Phase**:
- In the plateau phase, the birth rate and death rate are nearly equal. This means that the number of individuals being born is approximately the same as the number of individuals dying.

4. **Determine the Implication of Equal Birth and Death Rates**:
- When the birth rate equals the death rate, the population does not grow, which is referred to as zero population growth.

5. **Select the Correct Option**:
- Based on the analysis, the correct answer to the question is that the number of deaths and births in the last stage of the sigmoid growth curve is equal.

Thus, the correct answer is **(d) Equal**.