Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): A population's density will decrease if the sum of mortality and emigration exceeds the sum of natality and immigration. Reason (R): Under normal conditions, births and deaths are the most important factors influencing population density. In the light of the above statements, choose the most approp

Step-by-step solution

Assertion is correct because population density at time t+1 is given by N_ t+1 = N_t + [(B+I) - (D+E)] . If the sum of mortality and emigration (D+E) is greater than the sum of natality and immigration (B+I) , the net change is negative, leading to a decrease in population density. Reason is also a correct statement as per NCERT, which states that under normal conditions, births and deaths are the most important factors influencing population density, while immigration and emigration assume importance only under sp