07 populations

Question 1

The technical term for birth rate is ______

Answer 1

natality.

Question 2

When a number of individuals of a species movesinto 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 movesout of an area, this is referred to as ______

Answer 4

emigration.

Question 5

The maximum number of individuals that anecosystem could hold assuming ideal conditions isreferred to as _______

Answer 5

biotic potential

Question 6

That non-living thing that can increase ordecrease the size of a species in a population iscalled the _____ factor.

Answer 6

abiotic

Question 7

The maximum number of individuals of aspecies that can be supported by an ecosystemis called the ______of theecosystem

Answer 7

carrying capacity

Question 8

If there are a large number of trees in asmall 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 thingsin an environment regardless of the density arecalled ______ factors

Answer 9

density-independent

Question 10

Those factors that affect the living things inan environment where the density is importantare called _____ factors.

Answer 10

density-dependent

Question 11

What change in the way humansobtained their food caused the humanpopulation to grow in a significant way??

Answer 11

When humans moved away from thehunter-gatherer way of obtaining foodto agriculture, human population grew.

Question 12

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

Answer 12

The new population is:10 000 + (50 + 20) – (40 + 60) = 9970 people.

Question 13

give a name to that bioticpotential 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 refersto the number that reach the age of reproduction.?

Answer 14

“capacity for survival.”

Question 15

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

Answer 15

“birth potential.”

Question 16

give a name to that bioticpotential of: Animals have differing number of years when they canreproduce 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 thehighest 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 weatherproper amount of waterabiotic that could decrease:hot dry weathernot enough nitrogen in the soil

Question 18

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

Answer 18

1 biotic increase could be nitrogen fixing, bacteria in the soil, or earthworms1 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 aparasite.

Answer 19

Density-dependent

Question 20

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

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 tocontrol rabbit population.

Answer 22

Density-dependent

Question 23

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

Answer 23

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

Question 24

Cedar waxwings are one of the birds that can withstandthe cold and available food during our winters. To ease thestrains of winter, bird watchers provide the waxwings withseeds during the winter months. b)Provide a hypothesis that explains why bird watchershave noted an increase in the falcon population in recentyears.

Answer 24

If there are more cedar waxwings, the falcons areattracted to this food supply, so there are more ofthem.