Tag: population ecology

Questions Related to population ecology

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'.

During $2010-2012$ a square jungle having $5$k length has $5000$ bamboos. So what will be the population density of it?

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

  1. $100$

  2. $500$

  3. $50$

  4. $200$

Show answer
Correct Option: A

Which of the following statements is correct?

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

  1. The number of organisms can decrease but never increase once a population reaches its carrying capacity

  2. All populations experience exponential growth once they reach carrying capacity

  3. A population always grows rapidly once it reaches its carrying capacity

  4. Limiting factors can influence the number of organisms in a population once it reaches its carrying capacity

Show answer
Correct Option: D
Explanation:
Answer : 
i) Carrying Capacity-when the number of births equals the number of deaths, the population is at its carrying capacity for that habitat. 
ii) If resources are being used faster than they are being replenished, then the species has firstly exceeded its carrying capacity. 
iii) If this occurs, later the population will then decrease in size due to intraspecific competition for resources.

So the correct answer is option D. Limiting factors can influence the number of organisms in a population once it reaches its carrying capacity.

Which of the following statements defines the density of population?

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

  1. Number of persons living per unit area

  2. Number of persons living in a country

  3. Change in the number of inhabitants of a country during a specific period of time

  4. Absolute numbers added every year

Show answer
Correct Option: A
Explanation:

A population is a unit of biotic community made up of near permanent group of an interbreeding individual of a species found in a space or geographical area at a particular time. It is called local population or deme. Increasing population is a challenging issue for the developing country like India. If the population increases more than its carrying capacity it may lead to food crisis resulting in famines, hunger and poor health, acute shortage of shelter and clothing. Spreading awareness among the people about the ill-effects of increasing population may be helpful to control the over increasing population. So, the correct answer is option D.