Shortcut Methods
Shortcut Methods and Tricks
JEE Main/Advanced
- Population size: Use the formula (N=B-D+I-E), where N is the population size, B is the birth rate, D is the death rate, I is the immigration rate, and E is the emigration rate.
- Population density: Use the formula (D=N/A), where D is the population density, N is the population size, and A is the area or volume of the habitat.
- Birth rate: Use the formula (R_b=\frac{B}{N}), where (R_b) is the birth rate, B is the number of births, and N is the population size.
- Death rate: Use the formula (R_d=\frac{D}{N}), where (R_d) is the death rate, D is the number of deaths, and N is the population size.
- Immigration rate: Use the formula (R_i=\frac{I}{N}), where (R_i) is the immigration rate, I is the number of immigrants, and N is the population size.
- Emigration rate: Use the formula (R_e=\frac{E}{N}), where (R_e) is the emigration rate, E is the number of emigrants, and N is the population size.
- Population growth rate: Use the formula (r=B -D +I-E), where r is the population growth rate, B is the birth rate, D is the death rate, I is the immigration rate, and E is the emigration rate.
- Carrying capacity: Use the formula (K=\frac{R}{P}), where K is the carrying capacity, R is the renewable resources available, and P is the population size.
CBSE Board Exams
- Population size: Count the number of individuals in the population.
- Population density: Divide the population size by the area or volume of the habitat.
- Birth rate: Count the number of births that occur in the population per unit time.
- Death rate: Count the number of deaths that occur in the population per unit time.
- Immigration rate: Count the number of individuals that enter the population from outside per unit time.
- Emigration rate: Count the number of individuals that leave the population to outside per unit time.
- Population growth rate: Subtract the death rate from the birth rate.
- Carrying capacity: The carrying capacity of an environment is the maximum population size that the environment can support indefinitely, given the food, water, and other resources available.
