Population Growth - Exponential and Logistic - Unsolved Practice Set
Chapter: Organisms and Populations | Topic: Population Growth Exponential and Logistic
POPULATION GROWTH - EXPONENTIAL AND LOGISTIC - UNSOLVED PRACTICE SET
Topic: Population Growth Exponential and Logistic
Multiple Choice Questions
Q1. Exponential population growth occurs under conditions of:
- Limited resources and space
- Unlimited resources and no environmental resistance
- Constant predation pressure
- Zero reproduction
Q2. The graphical shape of a population undergoing exponential growth is typically described as:
- S-shaped (sigmoid)
- J-shaped
- A straight horizontal line
- A steadily declining curve
Q3. Logistic population growth occurs when a population's growth is limited by:
- Unlimited resources
- The carrying capacity of the environment (limited resources)
- The complete absence of any limiting factor
- Random chance alone
Q4. The graphical shape of a population undergoing logistic growth is typically described as:
- J-shaped
- S-shaped (sigmoid)
- A straight vertical line
- A completely flat line
Q5. In the logistic growth equation, the term "K" represents:
- The intrinsic rate of natural increase
- The carrying capacity of the environment
- The total population size at any given time
- The death rate of the population
Short Answer Questions
Q6. Define exponential population growth, and describe the shape of its characteristic growth curve.
Q7. Define logistic population growth, and describe the shape of its characteristic growth curve.
Q8. What is meant by the "carrying capacity" of an environment in the context of logistic growth?
Q9. Why is exponential growth generally considered unrealistic for most natural populations over a long period of time?
Long Answer Questions
Q10. Explain the exponential model of population growth, describing the conditions under which it occurs and the mathematical relationship (dN/dt = rN) that describes it.
Q11. Explain the logistic model of population growth, describing how carrying capacity limits growth and comparing this model to the exponential growth model.
APPLICATION / ANALYSIS
Q12. A population of bacteria in a nutrient-rich laboratory culture initially grows exponentially, but after some time, its growth rate slows down and eventually levels off as nutrients become limited. Explain, using your understanding of population growth models, why this shift from exponential to logistic growth occurs.
Q13. A population of 100 organisms has an intrinsic rate of increase (r) of 0.5 per year. Assuming unlimited resources and exponential growth, calculate the approximate population size after one year using the exponential growth relationship, and explain your calculation.