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Question
The two basic processes which contribute to a decrease in population density are
The two basic processes which contribute to a decrease in population density are
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Solution
The correct option is D Mortality and emigration
The size of a population for any species is not a static parameter. It keeps changing in time, depending on various factors including food availability, predation pressure and reduces weather. In fact, it is these changes in population density that give us some idea of what is happening to the population - whether it is flourishing or declining. Whatever might be the ultimate reasons, the density of a population in a given habitat during a given period fluctuates due to changes in four basic processes, two of which (natality and immigration) contribute an increase in population density and two (mortality and emigration) to a decrease.
(i) Natality in population ecology is the scientific term for birth rate.
(ii) Mortality is the number of deaths in the population during a given period.
(iii) Immigration is the number of individuals of the same species that have come into the habitat from elsewhere during the time period under consideration.
(iv) Emigration is the number of individuals of the population who left the habitat and gone elsewhere during the time period under consideration.
So, the correct answer is 'D'.
The size of a population for any species is not a static parameter. It keeps changing in time, depending on various factors including food availability, predation pressure and reduces weather. In fact, it is these changes in population density that give us some idea of what is happening to the population - whether it is flourishing or declining. Whatever might be the ultimate reasons, the density of a population in a given habitat during a given period fluctuates due to changes in four basic processes, two of which (natality and immigration) contribute an increase in population density and two (mortality and emigration) to a decrease.
(i) Natality in population ecology is the scientific term for birth rate.
(ii) Mortality is the number of deaths in the population during a given period.
(iii) Immigration is the number of individuals of the same species that have come into the habitat from elsewhere during the time period under consideration.
(iv) Emigration is the number of individuals of the population who left the habitat and gone elsewhere during the time period under consideration.
(iii) Immigration is the number of individuals of the same species that have come into the habitat from elsewhere during the time period under consideration.
(iv) Emigration is the number of individuals of the population who left the habitat and gone elsewhere during the time period under consideration.
So, the correct answer is 'D'.
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