Which of the following phenomenon will increase the population of a community in a region 1 nbs...........

Environment and Ecology Concept of Ecology

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Which of the following phenomenon will increase the population of a community in a region?

1. Dispersal

2. Natality

3. Mortality

4. Immigration

Select the correct answer using the code given below:

1 only

2 and 4 only

3 and 4 only

4 only

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Explanation:

! Statement 2 is correct: Birth Rate and Natality Rate -the number of live births per 1000 in a year.

! Birth rates are affected by such factors as nutrition, fertility, attitudes about abortion, labour value of children, government policies, social value, the availability of contraception and culture. ! Statemnet 3 is incorrect: Death rate and Mortality Rate-the number of deaths per 1000 in a year. Death rates are affected by disease, war, medical technology, improved health care, transportation development and nutrition.

! Statement 4 is correct: Immigration- the number of people moving into a country. Pull factors-characteristics of a place that attracts people to it.

! Statement 1 is incorrect: Emigration-the number of people leaving a country. Also dispersal from a region leads to reduction in population density.

! Push Factors-characteristics of a place that causes people to leave.

! Refugees- people who are forced to leave their country due to war, life- threatening discrimination, famine, or natural disasters.