Chapter 5- How Populations Grow Flashcards

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1
Q

Population density is

A

The number of individuals per unit area

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2
Q

What are the four characteristics that describe population

A

Geographic distribution
Density
Population age structure
Growth rate

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3
Q

What are two ways that a population can increase are

A

Immigration and increased birth rate

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4
Q

When does exponential growth occurs

A

Under ideal conditions such as unlimited resources, predation absence, and the absence of diseases

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5
Q

What shaped is the exponential growth rate curve

A

J shaped

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6
Q

Logistic growth occurs when

A

The birth rate decreases and and the death rate increases and when the birth rate and death rate occur at the sam state as resources become less available

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7
Q

What shape is the logistic growth curve

A

S shaped

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8
Q

What is the carrying capacity

A

The largest number of individuals that a given area can support

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9
Q

Density- Dependent limiting factors

A

Are limiting factors that depend on population size and density

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10
Q

Competition

A

Organisms compete for food, water, space, sun etc

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11
Q

Predation

A

Prey relationships is the best known population control mechanism

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12
Q

Parasitism

A

Taking nourishment from host organisms which often weakens them causing death and disease

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13
Q

Density independent factors

A

Population doesn’t influence the limiting factors they affect all populations in similar ways regardless of size

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14
Q

Why did the population grow in the industrial revolution

A

Everything was improved (hygiene and meds)

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15
Q

There are how many people in the world

A

7-8 bil

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16
Q

What were the two main improvement categories that made popluation rise in the US

A

Hygine-sewers and clean water

Antibiotics- drugs that kill bacteria

17
Q

What is the life expectancy 2017

A

79-woman

78-man

18
Q

Demography

A

Is the study of human population which includes the birth and death rate of a population along with the immigration and emigration numbers

19
Q

What is the demographic transition

A

It’s when growth slows or stops when countries get birth control education money and knowledge

20
Q

When will the earth level off and everyone will finish the demographic transition

A

When we get to 9-10 billion

Genetic engineering will help us feed all those people and we will not starve

21
Q

What are 3 prominent killer diseases today

A

Malaria
Cholera
AIDS