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Factors Affecting Population Density

The number of...

Question

The number of organisms in population are added by

A

Immigration

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B

Birth

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C

emigration

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D

both (a) & (b)

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Solution

The correct option is D
both (a) & (b)

Population growth is the increase in the number of individuals in a population. Population is added by births and immigration. Immigration is when people move to a place and the population of that place increases.

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Similar questions

When the number of immigration and births is more than emigration and deaths, the growth curve of the population will show

Q. Fill in the blanks
1. ___(i) ___ is the rate at which new individuals are added to a population by reproduction.
2. ___ (ii) ___ is the rate at which individuals are lost by death.
3. ___ (iii)

refers to individuals moving away from each other.
4. ___ (iv)

refers to individuals moving out of a population.
5.

refers to individuals moving into a population.

Q. Assertion :Emigration increases the size of local population. Reason: During emigration, individuals from other populations are added in the given population.

Q. A country's birth rate is the number of births per year per

1000

people in the country, and a country's death rate is the number of deaths per year per

1000

people. Immigration refers to the number of people who move into a country each year, and emigration refers to the number of people who move out of the country each year. A country's population growth is determined by these four variables. Table

1

gives birth, death, immigration and emigration rates in four countries and lines

1 - 4

1

model in the population for the four countries shown over time.

	Birth	Death	Immigration	Emigration
East Zealand	$20$	$x$	$1000$	$1000$
West Zealand	$21$	$21$	$12100$	$y$
South Zealand	$36$	$24$	$z$	$500$
North Zealand	$13$	$13$	$82000$	$9600$

Name the country whose population is represented by line

1

.

Q. Number of immigration is more than emigration and death is lower than natality. Growth curve of population will show

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Factors Affecting Population Density

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