Question

If in a population of size ‘N’ the birth rate is represented as ‘b’ and the death rate as ‘d’, the increase or decrease in ‘N’ during a unit time period ‘t’ will be:
The equation given above can also be represented as:
What does ‘r’ represent? Write any one significance of calculating ‘r’ for any population.

Answer 1

Answer:

r = N-b-d/t

Explanation:

This is because Size of population minus birth and death upon time will give a perfect population

Answer 2

r = instrinsic rate of increase (= per capita rate of increase and equals birth rate minus death rate);

Explanation:

dN/dt = rN  

where dN/dt = change in population size;

r = instrinsic rate of increase (= per capita rate of increase and equals birth rate minus death rate);

N = population size.

All populations can change in size with time ;

i) the population grows ,if births exceed deaths.

ii) the population decrease, if deaths exceed births,

iii) when births and deaths  does equal, the population stay the same.