Knowledge in population

Population structure

Population refers to the individuals living or inhabiting in the same area at the same time.Its dynamics depends upon age,density,dispersion,size & speciation. Factors of population: 1.Natality:no. of individuals added through birth. 2.Mortality:no. of individuals removed through death. Population density:no. of individuals in a population per unit habit area.It depends on structure ,age & mating. A speciation in a population dynamics involves generation or formation of new species through evolution that may occur in a particular geographical area. Types of speciation: 1.Sympatric:When new & existing species live in same geographical area at same time period. 2.Allopatric:When different species live in diiferent geographical ares but at same period of time. 3.Parapatric:Addition of new species to a new geographical area which may lead to positive & negative interactions between population groups which may lead to deletion of a few selected species. Population dispersion can be in the form of cluster,clump,uniform or random. Fluctuation in a population may occur due to environmental changes. Population studies are represented as demographs,Its a graphical way of representing population statics,they are usually related to  a no. of 1000 or more.They can be in the form of stable,expanding or declining structure. Population growth depends on biotic & abiotic factors,they are charachterised as both generalised & logical.In generalised form there are four phases such the lag phase which is the early growth phase,log phase which is the exponential phase,stationary or stable phase & declining or death phase.In logical form,it is assumed that more  no. of population are found in that particular period of time. Survivalship curve refers to an organisms adapatation & its ability to reproduce naturally under a given duration of time which later on represented in the form of a graph. Factors influencing population growth are natural calamities,birth & death rate,increased predation,competetion for food & other resources & disease.  

Population and Growth

Population and its growth notes for environmental studies

Organisms and population

the pdf contains information about organisms and population. the notes are helpful for neet


THE METHOD OF PROJECTING THE POPULATION The projections are demographic. Future populations are derived from a base population through the projection of... The projection of the demographic components of change is driven by the composition of the population by age, sex,... The definition of the population with respect to who is included and the characteristics of included people remains.