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 refers to

  1. Number of women per thousand men

  2. Number of individuals per square kilometer at any given time

  3. Number of men per thousand women

  4. Number of men died in a year
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Population density is defined as the number of individuals of a species per unit area or volume at a specific time. It is a fundamental measure in ecology.

Multiple choice zoology human population population ecology population size population and how it changes
The average population density of developing countries as India in comparison to developed countries like USA is

  1. Equal

  2. Less

  3. More

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

Population Density is defined as the number of people living per square km. As per the provisional population totals of Census 2011, the population density of India has been 382 persons per square kilometer. Population density in the United States was last measured at 34.86 in 2014, according to the World Bank. Therefore population density of developing country like India is more than developed country like the USA. So, the correct answer is option D.

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

Population density means

  1. The number of human per unit area

  2. The number of human in a unit area at a specific time

  3. The concentration of human population at a place

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

Population density of a species is the number of individual of a species per unit area or volume e.g.,number of animals per square km. 

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

Carrying capacity of a population is determined by

  1. Limiting resources

  2. Mortality rate

  3. Natality rate

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

Carrying capacity is the maximum population size of a species that an environment can sustain indefinitely, given the food, habitat, water, and other necessities available in the environment (limiting resources).

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. limiting resources

  2. natality

  3. mortality

  4. population growth rate
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The carrying capacity of an environment refers to the maximum number of organisms that it can support. It is usually denoted by a K and is determined by the limiting resources like food and space.
So, the correct answer is 'limiting resources'
Multiple choice zoology human population population ecology population size population and how it changes

Logistic growth occurs when there is

  1. A fixed carrying capacity

  2. Asexual reproduction only

  3. Sexual reproduction only

  4. No inhibition from crowding
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Logistic growth occurs when the population size increases with time but levels off after reaching a maximum which is known as the carrying capacity. Carrying capacity is fixed and is the maximum number of individuals that can be supported by a population. So, the correct option is 'a fixed carrying capacity'.

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

Which of the following statements is correct?

  1. The number of organisms can decrease but never increase once a population reaches its carrying capacity

  2. All populations experience exponential growth once they reach carrying capacity

  3. A population always grows rapidly once it reaches its carrying capacity

  4. Limiting factors can influence the number of organisms in a population once it reaches its carrying capacity
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Answer : 
i) Carrying Capacity-when the number of births equals the number of deaths, the population is at its carrying capacity for that habitat. 
ii) If resources are being used faster than they are being replenished, then the species has firstly exceeded its carrying capacity. 
iii) If this occurs, later the population will then decrease in size due to intraspecific competition for resources.

So the correct answer is option D. Limiting factors can influence the number of organisms in a population once it reaches its carrying capacity.
Multiple choice zoology human population population ecology population size population and how it changes

Which of the following statements defines the density of population?

  1. Number of persons living per unit area

  2. Number of persons living in a country

  3. Change in the number of inhabitants of a country during a specific period of time

  4. Absolute numbers added every year
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A population is a unit of biotic community made up of near permanent group of an interbreeding individual of a species found in a space or geographical area at a particular time. It is called local population or deme. Increasing population is a challenging issue for the developing country like India. If the population increases more than its carrying capacity it may lead to food crisis resulting in famines, hunger and poor health, acute shortage of shelter and clothing. Spreading awareness among the people about the ill-effects of increasing population may be helpful to control the over increasing population. So, the correct answer is option D.

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.