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 population of karnataka geography

Which one of the following is not a reason for the lower population growth rate in Karnataka in comparison to the national growth rate?

  1. Success of the family welfare programme

  2. Birth control

  3. Literacy programmes

  4. Migration to other states
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Migration to other states is not a reason for the lower population growth rate in Karnataka compared to the national average; rather, factors like family welfare programs and literacy are the primary drivers.

Multiple choice geography no place for us? migration and its effects migration : factors, types and consequences migration

Immigration rate is calculated by ___________.

  1. IR= number of people coming into a country in a given area/midyear population multiplied by 1000

  2. IR= number of people going out of country in a given area/midyear population multiplied by 1000

  3. Both formulae can be used

  4. Both A and B are wrong
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The movement by people from one place to another with the intention of settling, permanently in the new location is called migration. People coming into your country from another country for the purpose of taking up residence is called immigration and the people are called immigrants. Immigration rate is calculated as:

IR= number of people coming into a country in a given area/midyear population multiplied by 1000.

Multiple choice mean and median mean maths assumed mean method assumed mean method of finding mean measure of central tendency

The most appropriate average to be used to compute the average rate of growth in population is:

  1. Arithmetic mean

  2. Median

  3. Geometric mean

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

In geometric mean method, the average percentage increase in the population is assumed to be constant decade to decade through which future population is worked out. Therefore, it is the most appropriate average to be used to compute the average rate of growth in population. 

Multiple choice biology plant growth growth rates and conditions for growth population ecology growth and development

Fastest phase of S-shaped growth curve is

  1. Lag phase

  2. Log Phase

  3. Stationary phase

  4. Both (a) and (B).
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

  • S-shaped logistic growth curve includes 3 phases:
  • Lag phase - When some organisms are introduced in an area, the population growth begins slowly.
  • Log phase - The conditions are ideal and the maximum growth rate is reached.
  • Stationary phase - Growth rate begins to slow down as factors such as food, water and space become limiting.
Thus, the correct answer is 'Log phase.'

Multiple choice biology plant growth growth rates and conditions for growth population ecology growth and development

In growth curve, maximum growth occurs during

  1. Lag phase

  2. Senescent phase

  3. Decline phase

  4. Exponential phase
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Bacterial growth is divided into four phases, namely lag phase, exponential phase, stationary phase and decline phase. In lag phase, there is very little or no bacterial growth. In this phase, bacteria are adjusting to the environment and synthesizing biochemicals and nutrients. In log phase, the number of bacterial cells doubles at an exponential rate. The maximum growth phase is the exponential phase. In stationary phase, the rate of cell death is equal to the rate of cell division. In decline phase, there is the decrease in the bacterial population due to lack of nutrients and high toxin concentration.
Thus, the correct answer is option D.
Multiple choice biology plant growth growth rates and conditions for growth population ecology growth and development

The maximum growth phase is

  1. Lag phase

  2. Steady phase

  3. Log phase

  4. Senescent phase
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Bacterial growth is divided into four phases, namely lag phase, log phase, stationary phase and death phase. In lag phase, there is very little or no bacterial growth. In this phase, bacteria are adjusting to environment and synthesizing biochemicals and nutrients. In log phase, the number of bacterial cells doubles at an exponential rate. The maximum growth phase is log phase. In stationary phase, the rate of cell death is equal to the rate of cell division. In death phase, there is decrease in the bacterial population due to lack of nutrients and high toxin concentration.
Thus, the correct answer is option C.
Multiple choice biology plant growth growth rates and conditions for growth population ecology growth and development

Growth curve indicates 

  1. A growth parameter at various intervals

  2. Absolute growth

  3. Absolute increase

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

Growth curve has three different phases as :
1. Lag phase (where cell prepares for growth),
2. Log phase (where cell actually grows) and
3. Stationary phase (growth ceases).
Thus, these three phases indicates different parameters of growth at different levels. Hence, the correct answer is option (A) - 'A growth parameter at various interval'.

Multiple choice biology plant growth growth rates and conditions for growth population ecology growth and development

Maximum of growth occurs in

  1. Exponential phase

  2. Decline phase

  3. Stationary phase

  4. Lag phase
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Bacterial growth is divided into four phases, namely lag phase, exponential phase, stationary phase and decline phase. In lag phase, there is very little or no bacterial growth. In this phase, bacteria are adjusting to environment and synthesizing biochemicals and nutrients. In exponential phase, the number of bacterial cells doubles at an exponential rate. The maximum growth occurs in this phase. In stationary phase, the rate of cell death is equal to the rate of cell division. In decline phase, there is decrease in the bacterial population due to lack of nutrients and high toxin concentration
So, the correct answer is 'Exponential phase'
Multiple choice biology plant growth growth rates and conditions for growth population ecology growth and development

In signoid growth curve, upper asymptote represents period of

  1. Establishment

  2. Negative acceleration

  3. Positive acceleration

  4. Equilibrium
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In a sigmoid growth curve, there are three phases, lag phase, exponential phase and steady state phase. The upper limit of the curve is called as upper asymptote. It represents the period of equilibrium. At this stage, birth rate and death rate are at balance. It is said to be at equilibrium because at this stage, there is equilibrium between biotic potential and environmental resistance.

Thus, the correct answer is option D.

Multiple choice biology plant growth growth rates and conditions for growth population ecology growth and development

Which of the following is not a feature of a J-shaped growth form of population?

  1. It is found in stable type of population.

  2. Exponential phase is very rapid.

  3. A crash phase occurs at the end of the growth.

  4. Environmental resistance does not operate.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

J-shaped growth curve is a curve on a graph that records the situation in which, in a new environment, the population density of an organism increases rapidly in and exponential or logarithmic form, but then stops abruptly as environmental resistance or some other factor suddenly becomes effective. The actual rate of population change depends on the biotic potential and population size. It may be summarized mathematically as 

                                           dN/dT= rN (with a definite limit on N)
where, N is the number of individuals in the population
t is time
and, r is a constant representing the intrinsic rate of increase (biotic potential) of the organism concerned.
The population grows exponentially, and after attaining the peak value, the population may abruptly crash. This increase in population is continued till large amount of food materials exist in the habitat.
So the correct option is 'it is found in stable type of population'.

Multiple choice biology plant growth growth rates and conditions for growth population ecology growth and development

 Because of the which of the following reason/s, growth stops completely during the stationary phase?

  1. Lack of nutrients

  2. Saturation of nutrients

  3. Over availability of nutrients

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

The stationary phase is the phase in which the growth of lant generally stops and the plant proceeds towards maturity it may occur due to the lack of nutrients majorly seen in the unfavourable season.

So, the correct option is 'Lack of nutrients'.

Multiple choice biology plant growth growth rates and conditions for growth population ecology growth and development

Exponential growth is shown during

  1. Lag phase

  2. Log phase

  3. Maturation phase

  4. Senescence phase
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Bacterial growth is divided into four phases, namely lag phase, log phase, stationary phase and death phase. In lag phase, there is very little or no bacterial growth. In this phase, bacteria are adjusting to environment and synthesizing biochemicals and nutrients. In log phase, the number of bacterial cells doubles at an exponential rate. This phase shows maximum or exponential growth. In stationary phase, the rate of cell death is equal to the rate of cell division. In death phase, there is decrease in the bacterial population due to lack of nutrients and high toxin concentration.
Thus, the correct answer is option B.
Multiple choice civics individual and society achieving equality moving towards equality diversity and discrimination

What is Net-Reproduction rate?

  1. Number of deaths of children below one year of age per 1000 live birth

  2. Birth rate minus death rate

  3. Average age to which a person at the time of his birth is expected to live

  4. The rate at which women are replaced by daughter who will have children.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The Net Reproduction Rate (NRR) is a demographic measure representing the average number of daughters that would be born to a woman if she passed through her lifetime conforming to the age-specific fertility and mortality rates of a given year.