07 populations

Question 1

The technical term for birth rate is ______

Answer 1

natality.

Question 2

When a number of individuals of a species moves

into an area, this is referred to as _____

Answer 2

immigration

Question 3

Another word for “death rate” is ______

Answer 3

mortality.

Question 4

When a number of individuals of a species moves

out of an area, this is referred to as ______

Answer 4

emigration.

Question 5

The maximum number of individuals that an
ecosystem could hold assuming ideal conditions is
referred to as _______

Answer 5

biotic potential

Question 6

That non-living thing that can increase or
decrease the size of a species in a population is
called the _____ factor.

Answer 6

abiotic

Question 7

The maximum number of individuals of a
species that can be supported by an ecosystem
is called the ______of the
ecosystem

Answer 7

carrying capacity

Question 8

If there are a large number of trees in a
small area in a forest, we say that the _____
of the trees is large

Answer 8

density

Question 9

Those factors that affect all the living things
in an environment regardless of the density are
called ______ factors

Answer 9

density-independent

Question 10

Those factors that affect the living things in
an environment where the density is important
are called _____ factors.

Answer 10

density-dependent

Question 11

What change in the way humans
obtained their food caused the human
population to grow in a significant way??

Answer 11

When humans moved away from the
hunter-gatherer way of obtaining food
to agriculture, human population grew.

Question 12

Suppose that a town starts with a
population of 10 000 people. In one year,
natality accounts for 50 individuals and
mortality has 40 people. The immigration
number is 20 and the emigration is 60.
What is the new population of the
town?

Answer 12

The new population is:

10 000 + (50 + 20) – (40 + 60) = 9970 people.

Question 13

give a name to that biotic

potential of: The number of times a species reproduces each year

Answer 13

This is called “procreation.

Question 14

give a name to the biotic potential: Of all the offspring that a species produces, this refers
to the number that reach the age of reproduction.?

Answer 14

“capacity for survival.”

Question 15

give a name to that biotic
potential of: Some living things produce only 1 offspring. Other living
things can produce many more.

Answer 15

“birth potential.”

Question 16

give a name to that biotic
potential of: Animals have differing number of years when they can
reproduce and make more of their young

Answer 16

“length of reproductive life.”

Question 17

Suppose you want to plant peas in your garden and get the
highest yield possible.
What are 2 abiotic factors that could increase and 2 that could decrease your total yield?

Answer 17

abiotic that could increase: warm/sunny weather
proper amount of water
abiotic that could decrease:
hot dry weather
not enough nitrogen in the soil

Question 18

Suppose you want to plant peas in your garden and get the
highest yield possible.
b) What is one biotic factor that could increase the number of
pea plants and a biotic factor that could decrease the plant
population?

Answer 18

1 biotic increase could be nitrogen fixing, bacteria in the soil, or earthworms
1 biotic that could decrease could be rabbits that eat them.

Question 19

say if the example given is density dependant or density independent: Disease caused by a microorganism or a
parasite.

Answer 19

Density-dependent

Question 20

say if the example given is density dependant or density independent: Destruction of the habitat due to burning of
forests.

Answer 20

density independent:

Question 21

say if the example given is density dependant or density independent: Spraying a lawn with pesticides.

Answer 21

density independent:

Question 22

say if the example given is density dependant or density independent: Introducing more wolves into an area to
control rabbit population.

Answer 22

Density-dependent

Question 23

Cedar waxwings are one of the birds that can withstand
the cold and available food during our winters. To ease the
strains of winter, bird watchers provide the waxwings with
seeds during the winter months.
a) Would the seeds alter the carrying capacity of the
ecosystem? Explain

Answer 23

The carrying capacity increases because it is possible
for more birds to survive the winter, especially if there
is a heavy snow cover.

Question 24

Cedar waxwings are one of the birds that can withstand
the cold and available food during our winters. To ease the
strains of winter, bird watchers provide the waxwings with
seeds during the winter months.
b)Provide a hypothesis that explains why bird watchers
have noted an increase in the falcon population in recent
years.

Answer 24

If there are more cedar waxwings, the falcons are
attracted to this food supply, so there are more of
them.