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Which of the following would necessarily decrease the density of a population in a given habitat?
- a)Immigration > emigration
- b)Natality and immigration
- c)Natality > mortality
- d)Mortality and emigration
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
Which of the following would necessarily decrease the density of a pop...
Mortality no. of death in the population and emigration means no. of individuals left the habitat and gone at another place. so both will decrease no. of individuals in population hence decreasing population density
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Which of the following would necessarily decrease the density of a pop...
Understanding Population Density
Population density refers to the number of individuals of a species per unit area in a habitat. Several factors can influence this density, including immigration, emigration, natality (birth rate), and mortality (death rate).
Factors Affecting Population Density
To determine which option would decrease the density of a population, we need to analyze each choice:
a) Immigration > Emigration
- This scenario indicates that more individuals are moving into the population than leaving. Hence, this would increase population density.
b) Natality and Immigration
- An increase in both birth rates and the arrival of new individuals would lead to an overall increase in population density.
c) Natality > Mortality
- If the birth rate exceeds the death rate, the population will grow, thereby increasing density.
d) Mortality and Emigration
- This option involves both death and individuals leaving the population. When mortality is high and emigration occurs, the number of individuals in the habitat decreases.
Conclusion: Why Option D is Correct
- The combination of mortality and emigration results in a net loss of individuals from the population. This directly reduces the overall density in the habitat.
- Thus, option D is the only scenario that guarantees a decrease in population density, making it the correct answer.
Population density refers to the number of individuals of a species per unit area in a habitat. Several factors can influence this density, including immigration, emigration, natality (birth rate), and mortality (death rate).
Factors Affecting Population Density
To determine which option would decrease the density of a population, we need to analyze each choice:
a) Immigration > Emigration
- This scenario indicates that more individuals are moving into the population than leaving. Hence, this would increase population density.
b) Natality and Immigration
- An increase in both birth rates and the arrival of new individuals would lead to an overall increase in population density.
c) Natality > Mortality
- If the birth rate exceeds the death rate, the population will grow, thereby increasing density.
d) Mortality and Emigration
- This option involves both death and individuals leaving the population. When mortality is high and emigration occurs, the number of individuals in the habitat decreases.
Conclusion: Why Option D is Correct
- The combination of mortality and emigration results in a net loss of individuals from the population. This directly reduces the overall density in the habitat.
- Thus, option D is the only scenario that guarantees a decrease in population density, making it the correct answer.
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