Tag: human population

Questions Related to human population

The smallest unit that can evolve through natural selection is

population and how it changes human population ecology and environment zoology

  1. Cell

  2. Clade

  3. Organism

  4. Population

  5. Species

Show answer
Correct Option: D
Explanation:

The differential success in the reproduction of individual organisms is a natural selection that takes place due to the interactions between individual organisms and their environments. Studies however, show that individual organisms do not evolve but it is the population that evolves. Hence, the correct answer is option D.

Refer to the table below containing data obtained for a rabbit population over a period of several years.

Year Number of rabbits
1 4
2 17
3 62
4 245


Assuming unlimited resources, what would be the approximate expected rabbit population in year 5?

population and how it changes human population ecology and environment zoology

  1. 5000

  2. 1000

  3. 500

  4. 300

  5. 100

Show answer
Correct Option: B
Explanation:

If the resources are unlimited, the population can continue growing exponentially. In the first year, there were 4 rabbits. In the second year, there were approximately 4 × 4 (42), or 16 rabbits. In the third year, there were 4 × 4 × 4 (43) rabbits, about 64. In the fourth year, there were approximately 4 × 4 × 4 × 4 (44) rabbits, or about 256. Following this pattern, we can assume in the fifth year there would be approximately 4 × 4 × 4 × 4 × 4 (45), or 1024 rabbits which is approximate 1000. 

Therefore, the correct answer is option B.

Populations have all of the following characteristics except

population and how it changes human population ecology and environment zoology

  1. Number of individuals

  2. Phenotype

  3. Sex ratio

  4. Age distribution

  5. Death rate

Show answer
Correct Option: B
Explanation:

A population is a group of individual of a species inhabiting a particular geographic area. Number of individuals (population size), sex ratio (ratio of total individuals of two genders), age distribution (number of individuals in different age groups namely, childhood, adults and old age) and death rate (ratio of number of dying individuals to total population size) are some of the characters of population. The phenotype is visual/physical expression of the genotype of an individual; hence, it is characters of individually determined by its genotype. Thus, the correct answer is option B.

Which of the following is not the characteristic of population?

population and how it changes human population ecology and environment zoology

  1. Size

  2. Density

  3. Age distribution

  4. Phenotype

  5. Death rate

Show answer
Correct Option: D
Explanation:

The phenotype is not the characteristic of the population. It is the set of observable characteristics of an individual resulting from the interaction of its genotype with the environment

Total size is the number of individuals in a population.
Population density is defined as the number of individuals per unit area or per unit volume of the environment.
Distribution is the spatial pattern of individuals in a population relative to one another.
Death rate means mortality which means the rate of death of individuals in a population. 
Therefore, the correct answer is option D.

Population growth is not affected by which one of the following density-dependent factor?

population and how it changes human population ecology and environment zoology

  1. Limited nutrients

  2. Climate and temperature

  3. Build-up of toxins

  4. Predation

  5. Limited water

Show answer
Correct Option: B
Explanation:
Climate temperature is not related to density-dependent factors affecting population growth because density-dependent factor is a limiting factor that depends on population size.
Density-dependent limiting factors include:
•   competition
•   predation
•   parasitism
•   disease, nutrients and water availability
Thus, the correct answer is option B. 

The relationship between a population and a species is described by

population and how it changes human population ecology and environment zoology

  1. A species is one type of population

  2. A species is a local subset of a population

  3. A population is a group of organisms occupying a specific area

  4. A population encompasses many different species

  5. The terms population and species are interchangeable.

Show answer
Correct Option: C
Explanation:

Population is a group of individuals of same species that occupy a specific area. A species can have one or more than one population i.e. population is local subset of species and a species can have many populations inhabiting in different areas. Since many populations that can interbreed make a species, these terms are not interchangeable.  Thus, the correct answer is option C.

What is the demographic transition of a society?

population and how it changes human population ecology and environment zoology

  1. Low birth rates and low death rates

  2. Low birth rates and high death rates

  3. High birth rates and low death rates

  4. High birth rates and high death rates

  5. High birth rates and high emigration

Show answer
Correct Option: A
Explanation:

Demographic transition of a society is the changing pattern of the population from high birth and death rates to the low birth and death rates over the time period. It indicates the economic changes in the particular region as the country develops from a pre-industrial to an industrialized one. Thus, the correct answer is option A.

Which of these best describes a population? 

population and how it changes human population ecology and environment zoology

  1. All of the frogs, dragonflies and water nymphs living in a pond.

  2. All of the soil organisms in a garden including the type of soil and moisture content of the soil.

  3. All of the E. coli bacteria living in your intestines.

  4. All of the different types of birds living in a wetland.

  5. An individual Eastern Spotted Skunk Iivng in a prairie.

Show answer
Correct Option: C
Explanation:
Population is a group of individual organisms of the same species in a given area.
Among all options, its option C which describes a population because it is showing the group of individuals of one species only i.e. E. coli living in a given area (intestine in this case).
So, the correct answer is 'All of the E. colibaceria living in your intestines'.

First population count in India was started in

population and how it changes human population ecology and environment zoology

  1. 1852

  2. 1891

  3. 1901

  4. 1951

Show answer
Correct Option: B
Explanation:

First population count in India was done in 1872 but due to many irregularities in it, 1891 census is considered as country's first census.

Populations are said to be sympatric when ......

population and how it changes human population ecology and environment zoology

  1. Two populations live together and freely interbreed to produce sterile offspring

  2. Two populations are physically isolated by natural barriers

  3. Two populations are isolated but occasionally come together to interbreed

  4. Two populations share the same environment but cannot interbreed

Show answer
Correct Option: D