Question

7. There are particular factors that quantitatively influence population growth. Choose the
correct factor that is being described from the list below.

Descriptions
-The number of individuals that leave the population;
can be due to abiotic factors (e.g., escape from fire,
drought, flood, or climate change) or biotic factors
(e.g., increased competition)
-Number of births; tends to increase with food supply
and decrease with competition
-Death; may be due to kill-off (predation) or die-off
(disease, starvation, or exposure)
-The number of individuals entering the population
from outside; can be due to abiotic factors
(e.g., escape from fire, drought, flood, or climate
change) or biotic factors (e.g., increased competition)

Factors
A. emigration
B. immigration
C. mortality
D. natality

Answer 1

Ans:

A. emigration - The number of individuals that leave the population can be due to abiotic factors (e.g., escape from fire, drought, flood, or climate change) or biotic factors (e.g., increased competition)

D. natality - Number of births; tends to increase with food supply and decrease with competition

C. mortality - Death; may be due to kill-off (predation) or die-off (disease, starvation, or exposure)

B. immigration - The number of individuals entering the population from outside; can be due to abiotic factors (e.g., escape from fire, drought, flood, or climate change) or biotic factors (e.g., increased competition) Factors

Explanation: Emigration is the one way movement of individuals out of a population whereas Immigration is the one way movement of individuals into a population. Natality is the ability of individuals of population to produce individuals and it's rate is equivalent to birth rate. Mortality is the death of individuals in the population it is expressed as the number of individuals dying in a give time. This four parameters effect population size and density.