Concept explainers
To determine:
The part of the graph that indicates exponential growth.
Introduction:
A population can be defined as a group of individuals of the same species living in the same geographic area. A population has certain attributes that an individual organism does not have, such as, birth rate, death rate and sex ratio.
Answer to Problem 2STP
In the given graph, the number 1 indicates J-shaped graph which is exponential growth.
Explanation of Solution
The density of population fluctuates due to following reasons:
Natality (B): It refers to the number of births in a given period of time that are added to the initial density.
Mortality (D): It refers to the number of deaths that are deleted from the initial density.
Immigration (I): It refers to the number of individuals who have come into the habitat from somewhere else and are added to the population.
Emigration (E): It refers to the number of individuals who left the population and migrated somewhere else.
So, if N is the population density at time t, then population density at time t+1 can be shown as:
Nt+1 = Nt+ ( B+I ) − ( D+E )
B = Birth rate
I = Immigrants
D = Death rate
E = Emigrants
There are two modes of population growth.
1. Exponential growth: This type of growth curve occurs when resources are limited. Population continues to grow as there is no shortage of resources, and it results in J-shaped curve.The expression which defines exponential growth is given as dN/dt = rN where r = (b-d) and dN/dt is change in population density in time t.
2. Logistic growth:This type of growth curve occurs when resources are limited. The population expansion decreases as the resources become limited or scarce. It levels off when the
Chapter 8 Solutions
Biology Illinois Edition (Glencoe Science)
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