Exponential growth is observed in a population when

Options

A. resources in the habitat are unlimited
B. each species has the ability to realise its full innate potential
C. both (a) and (b)
D. none of these

Explanation

**Step-by-Step Solution:**

1. **Understanding Population Growth Models**:
- There are two primary models of population growth: logistic growth and exponential growth. Logistic growth occurs when resources are limited, while exponential growth occurs under conditions of unlimited resources.

2. **Logistic Growth Characteristics**:
- In logistic growth, as the population increases, it eventually reaches a carrying capacity, which is the maximum number of individuals that the environment can sustain. This growth is represented by an S-shaped curve (sigmoid curve).

3. **Exponential Growth Characteristics**:
- Exponential growth happens when a population has access to unlimited resources. In this scenario, there are no limiting factors to growth, allowing the population to increase rapidly. This growth is represented by a J-shaped curve.

4. **Conditions for Exponential Growth**:
- For exponential growth to occur, the following conditions must be met:
- **Unlimited Resources**: The population must have access to unlimited food, shelter, and other necessary resources.
- **Biotic Potential**: The population must be able to realize its full reproductive potential without any constraints.

5. **Conclusion**:
- Exponential growth is observed in a population when there are unlimited resources available, allowing the population to grow rapidly without any limiting factors.