FORESTRY
ECOLOGY AND ENVIRONMENT
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Increases
|
|
|
Decreases
|
|
|
Stays the same
|
|
|
None of the above
|
Detailed explanation-1: -The two factors that decrease the size of a population are mortality, which is the number of individual deaths in a population over a period of time and emigration, which is the migration of an individual from a place.
Detailed explanation-2: -Overcompensation occurs when added mortality increases survival to the next life-cycle stage. Overcompensation can contribute to the Hydra effect, wherein added mortality increases equilibrium population size.
Detailed explanation-3: -Overall, population grows or shrinks through two very basic components – natural change (births minus deaths) and migration (domestic plus international).
Detailed explanation-4: -The natality rate is the number of births per thousand individuals per year. It increases the population size and its density. It is the rate at which new people are added to the population. The mortality rate is the number of deaths per thousand individuals per year.