Zoology - Organisms and Populations Question with Solution | TestHub
ZoologyOrganisms and PopulationsPopulationsEasy2 minPYQ_2020
ZoologyEasysingle choice
In a population of an area, the difference in the natality rate and mortality rate is zero in a particular year, but the population density has decreased. Which of the following may be the reason for that increase?
Options:
Answer:
C
Solution:
Natality and immigration contribute to an increase in population density, while mortality and emigration tend to decrease the size.
The density of a population (N) at time t can be expressed after a period of time (t + 1) as:
N(t+1) = Nt + [ (B + I) - (D + E) ]
where B denotesthe number of births,I denotesthe number of immigrants,D isthe number of deaths andE is thenumber of emigrants.
If B=D, and N(t+1)< Nt, then I < E.
Stream:NTA_ABHYAS_NEETSubject:ZoologyTopic:Organisms and PopulationsSubtopic:Populations
⏱ 2mℹ️ Source: PYQ_2020
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