Question

"The population of a metro city experiences fluctuations in its population density over a period of time".

(a) When does the population in a metro city tend to increase?
(b) When does the population in metro city tend to decline?
(c) If 'N' is the population density at the time 't', write the population density at the time 't + 1'.

Answer 1

(a) When resources in the metro cities (habitat) are unlimited, each species has the ability to realise its innate potential to grow in number. Hence, population in metro cities tend to increase. Immigration is another cause.

(b) When resources present in the environment are limiting, the population in metro cities (habitat) tends to decline. Emigration is another cause.

(c) Population density at time (t+1) is written as-
$N_{t+1}=N_t+\left[\right(B+I)-(D+E\left)\right]$

where,
B- Birth, D- Death, I- Immigration, E- Emigration