Organisms and Populations Test

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Organisms and Populations Test - 77

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Weekly Quiz Competition

Question 1
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Which one has mainly controlled human population density?

A
Industry

B
Natural resources

C
Climate

D
Communication

Solution

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.
Question 2
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Which one of the following factors has contributed most in the rapid rise of human population in the present century?

A
Decrease in infant mortality

B
Polygamy

C
Decrease in birth rate

D
Increase in death rate

Solution

In the present century, reduced infant mortality contributed 4.5 years to overall improvements in life expectancy; reduced child mortality contributed nearly as much, and reduced mortality among young adults added about 3.5 years.
So, the correct answer is option A.
Question 3
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Number of births per 1000 is

A
Growth rate

B
Conception rate

C
Reproduction rate

D
Crude birth rate

Solution

The crude birth rate is the number of live births per 1,000 people per year. Another term used interchangeably with birth rate is natality. When the crude death rate is subtracted from the crude birth rate, the result is the rate of natural increase (RNI).
So, the correct answer is option D.
Question 4
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The country with maximum population density

A
China

B
U.S.A

C
Japan

D
India

E
Monaco

Solution

Population density is the number of people per unit of area. Monaco, in South Europe, currently holds the record for being the most densely populated nation in the world.
So, the correct answer is option E.
Question 5
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Growth of population is due to

A
Natality and emigration

B
Natality and immigration

C
Mortality and immigration

D
Mortality and emigration
Solution
- There are two factors that result in an increase in the size of a population.
- First, there is natality, which is the number of individuals that are added to a population over a period of time due to reproduction.
- The second factor that can cause a rise in a population is immigration. Immigration is the migration of an individual into a place.
- When an individual immigrates to a new location, they increase the population within that area.
So, the correct answer is option B.
Question 6
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Which of the following factors affect human life with increasing to population density?

A
Availability of food housing and health facilities

B
Urbanization

C
Education

D
None of the above

Solution

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.
Question 7
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Exponential growth is shown by

A
Unicellular forms

B
A cell in tissue culture

C
Embryo

D
Multicellular plants

Solution

Cells in culture usually follow a standard growth pattern. The first phase of growth after the culture is seeded is the lag phase, which is a period of slow growth when the cells are adapting to the culture environment. The lag phase is followed by the log phase (logarithmic phase), a period where the cells divide exponentially and consume the nutrients in the growth medium. When all the growth medium is spent (one or more of the nutrients is depleted) or when the cells occupy all of the available substrates, the cells enter the stationary phase.
Therefore, the correct answer is option B.
Question 8
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Main factor in increasing the population is

A
Early marriage

B
Suitable and favourable environment

C
More reproductive capacity

D
Higher natality and lower mortality

Solution

It is in the less developed countries that the continued growth in population occurs in the twenty-first century. Rapidly growing population is a population, which has high birth rate and low death rate, so there are number of young individuals in the population.
So, the correct answer is option D.
Question 9
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After 17$$^{th}$$ century, human population is in which stage

A
Zero growth stage

B
Exponential growth stage

C
Sigmoid stage

D
Constant stage

Solution

The global population growth was very slow until the 1750. There was a long period of stationary growth phase as there was no growth, with the world's population about 300 million. But after 1750, the world's population grew significantly.
Thus, the correct answer is option B.
Question 10
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The density of population can be calculated

A
$$D = \displaystyle\frac{N}{S}$$

B
$$D = \displaystyle\frac{S}{N}$$

C
$$D = \displaystyle\frac{S}{W} $$

D
$$D = \displaystyle\frac{W}{S} $$

Solution

Population density is the number of organisms of a species per unit area (space) at a particular time. In the formula, D stands for population density, N stands for the number of organisms, and S stands for the area.
$$D = \displaystyle\frac{N}{S} $$
So, the correct answer is option A.

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Re-Attempt Weekly Quiz Competition

Organisms and Populations Test - 77

Result

Organisms and Populations Test - 77

Score

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SHARING IS CARING

Question 1

Industry

Natural resources

Climate

Communication

Solution

Question 2

Decrease in infant mortality

Polygamy

Decrease in birth rate

Increase in death rate

Solution

Question 3

Growth rate

Conception rate

Reproduction rate

Crude birth rate

Solution

Question 4

China

U.S.A

Japan

India

Monaco

Solution

Question 5

Natality and emigration

Natality and immigration

Mortality and immigration

Mortality and emigration

Solution

Question 6

Availability of food housing and health facilities

Urbanization

Education

None of the above

Solution

Question 7

Unicellular forms

A cell in tissue culture

Embryo

Multicellular plants

Solution

Question 8

Early marriage

Suitable and favourable environment

More reproductive capacity

Higher natality and lower mortality

Solution

Question 9

Zero growth stage

Exponential growth stage

Sigmoid stage

Constant stage

Solution

Question 10

$$D = \displaystyle\frac{N}{S}$$

$$D = \displaystyle\frac{S}{N}$$

$$D = \displaystyle\frac{S}{W} $$

$$D = \displaystyle\frac{W}{S} $$

Solution

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