Tag: human population

Questions Related to human population

Population density is 

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

  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. $\displaystyle{\frac{No.  of  births}{Total  area  covered}}$

Show answer
Correct Option: B,C
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.

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

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

  1. Habitat

  2. Dispersion

  3. Size

  4. Density

  5. Growth rate

Show answer
Correct Option: B
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.

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

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

  1. Carrying capacity

  2. Population density

  3. Limiting factor

  4. $K$-selection

  5. $r$-selection

Show answer
Correct Option: A
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.

A herd of cattle was moved by a rancher to a different pasture. The carrying capacity of that pasteur exceeded is known by the fact that

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

  1. The herd increased in size

  2. The pasture became overgrazed and barren

  3. The pasture had more grasses

  4. The cows gained weight

  5. The cows had more calves

Show answer
Correct Option: B
Explanation:

Carrying capacity is the maximum size of the population of a species that a certain environment can support for an extended period of time. Overgrazing of pasture would make it barren. Once population overshoots the carrying capacity, it starts decreasing as at this point. An overgrazed pasture would no longer support the cattle leading them to starve or look for another food source. Thus, the correct answer is B.

The population size that an environment can sustain is called the 

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

  1. Maximum population

  2. Habitat

  3. Exponential limit 

  4. Logistic goal

  5. Carrying capacity

Show answer
Correct Option: E
Explanation:

The carrying capacity of an environment is the maximum population it can support with available resources. Carrying capacity is one of the limiting factors for population increase.

So, the correct answer is 'Carrying capacity'

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

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

  1. I only

  2. II only

  3. III only

  4. I and II only

  5. II and III only

Show answer
Correct Option: D
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'.

The carrying capacity of a population is determined by its

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

  1. Birth rate

  2. Death rate

  3. Limiting resource

  4. Reproductive status

Show answer
Correct Option: C
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.



At a given time in a forest 900 deer are found, 100 more deer can be accommodated, then 1000 is

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

  1. Mortality of deer

  2. Population carrying capacity for deer

  3. Maximum natality

  4. Realised natality

Show answer
Correct Option: B
Explanation:

Population carrying capacity of any environment is the maximum population size of a species that can have indefinite sustained growth. Here, for the deer being 1000.

So, the correct answer is 'Population carrying capacity for deer'

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

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

  1. Mortality Rate=Birth Rate

  2. Mortality Rate > Birth Rate

  3. Mortality Rate < Birth Rate

  4. None of the above

Show answer
Correct Option: A
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.

Scholars caught, marked and released 80 fishes in a pound. Later 100 fishes were caught at random. 40 of them were marked. The number of fishes in the pond is 

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

  1. 400

  2. 200

  3. 100

  4. 50

Show answer
Correct Option: B
Explanation:
Let's take the total number of fishes in the pond be x. 
When 80 fishes are marked, then the ratio of tagged fishes to total fishes is 80/x
When 100 fishes were caught out of which 40 were marked, then the ratio of tagged fishes to total fishes is 40/100
Taking the distribution of fishes in the pond to be uniform, the ratio of tagged fishes to the total fishes will be same in both the situations.
Hence, the equation can be shown as:
80/x = 40/100
This comes out to be 200
So, the correct answer is '200'.