Respuesta :
Answer: d. when it’s resources are unlimited.
Exponential growth is the increase in population of a species per unit area in a habitat in a given time when the resources available are unlimited. In nature, the population may grow exponentially for some time but ultimately will be limited depending upon the availability of resources.
In the presence of unlimited resources, the population grows rapidly, representing an exponential increase in growth.
Further explanation:
The exponential growth is obtained in a population when the resources are limitless. This makes the population expand more and more irrespective of the population size. For example,in a bacterial population that reproduces by fission, exponential growth can be seen. When a flask containing 1000 bacteria is supplied with unlimited nutrients, the bacteria divide to double (2000) in one hour. In the next hour, these 2000 bacteria will divide and produce 4000 organisms; 8000 organisms follow this and the numbers will keep on increasing with every hour of cell division. This explains the exponential growth concept in which the population growth rate keeps on accelerating at a greater pace with the addition of a number of organisms after each reproductive cycle in the presence of unlimited resources. The exponential growth is represented as a J shaped curve when the population size is plotted against time.
But such a scenario is not generally seen because the resources are never unlimited. Due to the limited resources and mutations, some bacteria either die or do not reproduce at all. This results in a reduced growth rate of the bacterial population. Therefore, while calculating the population growth rate, the death rate is also considered. For this reason, from the birth rate, the death rate is subtracted and is given by the formula:
ΔN/ΔT= B-D
Where,
ΔN = change in the number of organisms
ΔT = change in time
B = Birth rate
D = Death rate
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Answer details:
Grade: College Biology
Chapter: Population growth
Subject: Biology
Keywords:
Exponential growth, J shaped growth curve, population growth, birth rate, death rate, cell division, fission, reproduction, resources.
