Tag: zoology

Questions Related to zoology

Which of the following factors influence population density under normal conditions?

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

  1. Deaths

  2. Immigration

  3. Emigration

  4. Both (A) and (B)

Show answer
Correct Option: A
Explanation:

Under normal condition births and deaths influence density of a population the other two factors being only active under special condition 

The maximum possible number of individuals that a habitat can support is called its _________________.

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

  1. fecundity

  2. surviving ability

  3. carrying capacity

  4. biotin potential

Show answer
Correct Option: C
Explanation:

In nature, a given habitat has resources to support a certain number of individuals of a population, beyond which no further growth is possible. This limit is called as nature's carrying capacity (K) for that species in that habitat 

Which of the following would necessarily decrease the density of a population in a given habitat?

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

  1. Natality > mortality

  2. Immigration > emigration

  3. Mortality and emigration

  4. Natality and immigration

Show answer
Correct Option: C
Explanation:

Population density in a given habitat is influenced by four processes:
- Natality : It is the number of birth in a population during a given period of time,
- Mortality : It is the number of deaths in a population during a given period of time.
-Immigration : Number of individuals coming from other habitats in a given period of time 
-Emigration : Number of individuals exiting form a given population in a given period of time.

Mortality and emigration will, therefore decrease the population density while natality and immigration will increase it.
So, the correct answer is 'Mortality and emigration'.

Population density refers to

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

  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

Show answer
Correct Option: B
The average population density of developing countries as India in comparison to developed countries like USA is
zoology human population population ecology population size population and how it changes

  1. Equal

  2. Less

  3. More

  4. Everchanging

Show answer
Correct Option: C
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.

Population density means

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

  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

Show answer
Correct Option: B
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. 

Carrying capacity of a population is determined by

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

  1. Limiting resources

  2. Mortality rate

  3. Natality rate

  4. Predation

Show answer
Correct Option: A

The carrying capacity of a population is determined by its

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

  1. limiting resources

  2. natality

  3. mortality

  4. population growth rate

Show answer
Correct Option: A
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'

If the mean and the median pertaining to a certain character of a population are of the same value, the following is most likely to occur?

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

  1. A bi-modal distribution

  2. A T-shaped curve

  3. A skewed curve

  4. A normal distribution

Show answer
Correct Option: A
Explanation:

In statistics, a bimodal distribution is a continuous probability distribution with two different modes. These appear as distinct peaks in the probability density functions. If the distribution is symmetric then the mean is equal to the median and the distribution will have zero skewness. Since bimodal distribution is symmetric both mean and mode fall in the center but it has two modes.

So the correct answer is option A "bimodal distribution".

Logistic growth occurs when there is

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

  1. A fixed carrying capacity

  2. Asexual reproduction only

  3. Sexual reproduction only

  4. No inhibition from crowding

Show answer
Correct Option: A
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'.