Biology · Geography

Population Dynamics

940 Questions

Explore key concepts in population dynamics through these practice questions. The focus is on demographic transition models, population pyramids, and life history theory. These topics are useful for general studies and biology exams.

Demographic transition theoryPopulation pyramidsMathematical growth modelsLife history theory

Population Dynamics Questions

Multiple choice zoology human population population ecology population size population and how it changes

Population density of terrestrial organisms is measured in terms of individuals per _____________. 

  1. Metre
  2. $Metre^2$
  3. $Metre^3$
  4. $Metre^4$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

  • How many organisms there are per unit area is referred to as density.
Population density is a measurement of population size per unit area, i.e., population size divided by total land area.
  • and we normally measure the area in meter square. so option B is the correct answer 

Multiple choice zoology human population population ecology population size population and how it changes

The two basic processes which contribute to a decrease in population density are 

  1. Natality and emigration

  2. Mortality and immigration

  3. Natality and immigration

  4. Mortality and emigration

  5. Emigration and immigration
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The size of a population for any species is not a static parameter. It keeps changing in time, depending on various factors including food availability, predation pressure and reduces weather. In fact, it is these changes in population density that give us some idea of what is happening to the population - whether it is flourishing or declining. Whatever might be the ultimate reasons, the density of a population in a given habitat during a given period fluctuates due to changes in four basic processes, two of which (natality and immigration) contribute an increase in population density and two (mortality and emigration) to a decrease.
(i) Natality in population ecology is the scientific term for birth rate.
(ii) Mortality is the number of deaths in the population during a given period.
(iii) Immigration is the number of individuals of the same species that have come into the habitat from elsewhere during the time period under consideration.
(iv) Emigration is the number of individuals of the population who left the habitat and gone elsewhere during the time period under consideration.

So, the correct answer is 'D'.
Multiple choice zoology human population population ecology population size population and how it changes

"Verhulst-Pearl" logistic growth is described using the equation $\dfrac{dN}{dt}=rN(\dfrac{K-N}{K})$. In this K stands for

  1. Temperature in degree Kelvin

  2. Intrinsic rate of natural increase

  3. Carrying capacity

  4. Population density
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The population growth rate is measured in number of individuals in a population (N) over time (t). The term for population growth rate is written as (dN/dt). The d just means change. K represents the carrying capacity, and r is the maximum per capita growth rate for a population. Per capita means per individual, and the per capita growth rate involves the number of births and deaths in a population. The logistic growth equation assumes that K and r do not change over time in a population.

So, the correct answer is 'C'.
Multiple choice zoology human population population ecology population size population and how it changes

For which of the following cases, population density can be easily determined by utilizing non-biological parameter?

  1. Fish density

  2. Density of bacteria in culture plate

  3. Siberian cranes at Bharatpur wetlands

  4. Tiger census
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Non biological parameters of water can be easily used to determine the population density of the fishes.

Bacteria, Siberian cranes and Tigers are impacted heavily by biological parameters and their population cannot be just estimated on the basis of non biological parameters.
These parameters include :

  1. Presence of heavy metals
  2. pH of water
  3. Mineral content like nitrates and phosphorus
  4. Temperature
  5. Dissolved oxygen
  6. Turbidity
So the correct answer is 'Fish'.
Multiple choice zoology human population population ecology population size population and how it changes

If in a population showing sigmoid growth curve the value of K - N/K is 0.95, then what is true for this population.

  1. The carrying capacity has been nearly realized.

  2. The carrying capacity has not been substantially realized and it can accommodate many more organisms.

  3. The carrying capacity is only 50% realized.

  4. Data is insufficient to comment anything.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In the given example, K represents carrying capacity or the maximum capacity that can exist and N represents the actual population present at a particular time. If in a population showing sigmoid growth curve the value of K - N/K is 0.95, then the carrying capacity of this population has not been substantially realized and it can accommodate more organisms. This population has maximum growth rate because it shows that environment can sustain more population.

Thus, the correct answer is 'The carrying capacity has not been substantially realized and it can accommodate many more organisms.'

Multiple choice zoology human population population ecology population size population and how it changes

Which one has mainly controlled human population density?

  1. Industry

  2. Natural resources

  3. Climate

  4. Communication
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Natural resources are resources that people can use which comes from nature. People do not make natural resources but obtain from the nature such as air, water, wood, oil, wind energy, iron, and coal. Higher the population, more the demand on resources. Thus, the growth of human population will result in the decrease of natural resources. More the number of human will demand more of land, water, etc. In other words, availability of natural resources is a limiting factor of increase of human population. They are inversely proportional.
So, the correct answer is option B.
Multiple choice zoology human population population ecology population size population and how it changes

Which of the following factors affect human life with increasing to population density?

  1. Availability of food housing and health facilities

  2. Urbanization

  3. Education

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Human population is directly affected by - 

(1) Increases in food production and distribution, 
(2) Improvement in public health (water and sanitation)
(3) Medical technology (vaccines and antibiotics), along with gains in education and standards of living within many developing nations.
So, the correct answer is option A.

Multiple choice economics parameters (indicators) of development human development and human development index (hdi) hdi dynamic of human development

What are the three factors that determine population growth of a country?

  1. Natality, mortality, migration

  2. Standard of living, income, heredity

  3. Regional development, income, religion

  4. Religion, income and education
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Population growth is fundamentally determined by the balance of births (natality), deaths (mortality), and the movement of people (migration). These three demographic components dictate whether a population increases or decreases over time.

Multiple choice economics parameters (indicators) of development human development and human development index (hdi) hdi dynamic of human development

Consider the following indications:
1) High birth rate and low death rate
2) Low birth rate and low death rate
3) High birth rate and high death rate
The correct sequence of these in the course of economic development is:

  1. 3, 2, 1

  2. 1, 3, 2

  3. 2, 3, 1

  4. 3, 1, 2
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The sequence explains the theory of demographic transition.Before the economic modernizations, the country had stable or very slow growing population as a result of a combination of high birth rate and almost equally high death rate. With economic development, resulting in higher incomes, improved public health facilities, there was marked a decline in mortality that gradually raised life expectancy. With declining death rate but birth rate not falling correspondingly, the country passed through the second stage, marking the beginning of a demographic transition. Finally, the state third comes when the force and influence of modernization and economic development cause fertility to decline so that eventually falling birth rate converge with the lower death rate.

Multiple choice biology reproductive health reproductive health of humans need of family planning reproductive health problems different types of reproduction

The average number of children that would be borne to a female during her lifetime is called

  1. Natality

  2. Birth rate

  3. Population growth

  4. Total fertility rate
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The total number of children born or likely to be born to a woman in her lifetime if she were subject to the prevailing rate of age-specific fertility in the population is called as Total fertility rate.

So, the correct answer to the question is 'Total fertility rate'.

Multiple choice economics dynamic of human development development indices various development indexes social development

"Zero population growth" implies ________.

  1. a rate of growth giving a stable population

  2. the birth and death rates are near to zero

  3. the birth and death rates are equal

  4. low birth rate and low death rate
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Zero population growth is a condition where the number of people in a population remains unchanged. It means that the population neither grows or declines. This kind of demographic balance can be achieved when the growth and death rate are equal. Zero population growth is also referred to as the replacement level of fertility.

Thus, the correct answer is C.

Multiple choice economics dynamic of human development development indices various development indexes social development

What is Fertility Rate?

  1. The total number of children born in a country in a given year divided by the number of children dead

  2. The average number of children born to a woman during her reproductive years

  3. The number of births in a country divided by total population in a given year
  4. The number of women in the age group of $15-45$ years in a country divided by total number of women dying during child birth
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Fertility Rate means the number of children born to an average woman during her reproductive years. When we talk about fertility rate, we mean the number of live births in women over a specific length of time.

Multiple choice economics dynamic of human development development indices various development indexes social development

Fill in the blanks from the alternatives given.
The difference between birth rate and death rate is called _______.

  1. survival rate

  2. mortality rate

  3. fertility rate

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

There will be a growth in population, when the birth rate is higher than death rate. Also, the difference between birth rate and the death rate is called natural growth rate of population. Also, it can be called as the survival rate of population.

Thus, the correct answer is A.

Multiple choice population and how it changes human population ecology and environment zoology

All of the following are population's characteristics except

  1. Number of individuals

  2. Phenotype

  3. Sex ratio

  4. Age distribution

  5. Death rate
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Population characteristics (demographics) include metrics like size, density, sex ratio, age distribution, and birth/death rates. Phenotype is a characteristic of an individual organism, not a property of a population as a whole.