Question

Three Mark Questions.
(a) Explain "birth rate" in a population by taking a suitable example.
(b) Write the other two characteristics which only a population shows but an individual cannot.

Answer 1

Birth rate: It is the production of a new individual by birth, hatching, by asexual modes etc. It is expressed as the number of births per 1000 individuals of a population per year. Due to birth rate, population increases continuously.

Characteristics which are exhibited by population and not individual:

1. Population density / size - Number of individuals of a species per unit area or volume.
   
2. Population dynamics - Population growth change during time and depends on food availability, predation, pressure, weather and also depend on natality, mortality, immigration and emigration.