Biology · Geography

Population Dynamics

978 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 is 

  1. $\displaystyle{\frac{No. of individuals}{No. of houses}}$
  2. $\displaystyle{\frac{No. of births}{No. of individuals}}$
  3. $\displaystyle{\frac{No. of births}{Space}}$
  4. $\displaystyle{\frac{No. of births}{Total area covered}}$
Reveal answer Fill a bubble to check yourself
B,C Correct answer
Explanation

Population density is a measurement of population per unit area or unit volume. Formulas of population density is total population divided by total area. It can also be represented by number of births/no. of individuals and number of births/space.

Therefore, the correct answer is option B and C.

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

Even, clumped or random represents which property of the population?

  1. Habitat

  2. Dispersion

  3. Size

  4. Density

  5. Growth rate
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The demographic study is based on the estimation of the several factors related to a population. Dispersion plays an important role in determining the in demographic studies and indicates the distribution of species in a particular area. Individuals of a population can be distributed in one of three basic patterns, they can be more or less equally spaced apart (uniform dispersion), dispersed randomly with no predictable pattern (random dispersion), or clustered in groups (clumped dispersion).
So, the correct answer is option B.
Multiple choice zoology human population population ecology population size population and how it changes

The number of people that can be supported by the environmental resources without the degradation of environment is known as

  1. Carrying capacity

  2. Population density

  3. Limiting factor
  4. $K$-selection
  5. $r$-selection
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When the necessary conditions for sustaining life are adequately available, like the food, habitat, water, the maximum number of members of a species that the environment can sustain indefinitely can be called as the carrying capacity of the environment. Thus, the correct answer is option A.

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

Which are density-dependent factors that limit population size?
 I. Disease
 II. Space
 III. Earthquake

  1. I only

  2. II only

  3. III only

  4. I and II only

  5. II and III only
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Population density is the number of individuals per unit area.
I. Disease is a density dependent factor because more the number of individuals are there in a given area, more is the chances of people getting affected by the disease. 
II. Space is the area where any activity can be carried out. More the number of individuals in a given area, less will be the space. Hence, it is also a density dependent factor.
III. Earthquake is a natural calamity that occurs due to the tactic movement of plates under the earth's surface. It is neither dependent on a population size, nor the area. It happens suddenly at its own. Hence, it is not a density dependent factor.
So, the correct answer is 'I and II only'.
Multiple choice zoology human population population ecology population size population and how it changes

The carrying capacity of a population is determined by its

  1. Birth rate

  2. Death rate

  3. Limiting resource

  4. Reproductive status
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The carrying capacity of a population is determined by its limiting resources. Carrying capacity is the upper limit of an ecosystem upto which it can Provide the basic needs to the population under given circumstances.



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

When the population reaches carrying capacity, which of the following equation can be related to it?

  1. Mortality Rate=Birth Rate

  2. Mortality Rate > Birth Rate

  3. Mortality Rate < Birth Rate

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

Carrying capacity is the maximum number of population species that the particular environment can survive. In this case, the number of individuals that are mortal and the number of new births will be equal. SO, the mortality rate will be equal to birth rate. 

So, option A is the correct answer.

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

Increase in number of individuals in a population represents

  1. Natality

  2. Mortality

  3. Density

  4. Diversity
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In a population, if the number of individuals are more..the population density will be more. And if the population density is less..the number of individuals will be less. Density of a population is determined by the number of individuals residing in a particular area. 

So, option C is the correct answer.

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

___________ has defined human development as, "Human development is the process of widening people's choices as well as raising the level of well-being achieved".

  1. Human Development Report (1992)

  2. Human Development Report (1997)

  3. Human Welfare Report (1992)

  4. Human Welfare Report (1995)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The 1997 Human Development Report explicitly defined human development as the process of widening people's choices and raising their well-being.