NEET
- Exam
- NEET
- Subject
- Zoology
- Chapter
- Organisms and Populations
NEET · Zoology · Organisms and Populations
What does the equation N (t+1) = N (t) + [(B + I) - (D + E)])...
What does the equation N(t+1) = N(t) + [(B + I) - (D + E)]) describe?
Options
- AThe change in population density over time
- BThe birth rate of a population
- CThe genetic variation in a population
- DThe migration rate of a population
Correct answer
A. The change in population density over time
Step-by-step solution
So, if N is the population density at time t, then its density at time t +1 is N(t+1) = N(t) + [(B + I) – (D + E)] You can see from the above equation (Fig. 11.2) that population density will increase if the number of births plus the number of immigrants (B + I) is more than the number of deaths plus the number of emigrants (D + E). Under normal conditions, births and deaths are the most important factors influencing population density, the other two factors assuming importance only under special conditions. For instance, if a new habitat is just being colonized, immigration may contribute more significantly to population growth than birth rates.