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Populations and Communities 209

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.Populations and CommunitiesName Date

How do populations and communities interact and change?

Before You ReadBefore you read the chapter, think about what you know about populations and communities. Record your thoughts in the first column. Pair with a partner, and discuss his or her thoughts. Write those thoughts in the second column. Then record what you both would like to share with the class in the third column.

Lesson 1 Lesson 2 Lesson 3

NEWbiospherepopulationcommunitycompetitionlimiting factorpopulation densitybiotic potentialcarrying capacity

NEW birthratedeath rateextinct speciesendangered speciesthreatened speciesmigration

ACADEMICestimate

NEW habitatnicheproducerconsumersymbiosismutualismcommensalismparasitism

REVIEWpredator

Chapter Vocabulary

Think Pair Share

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firehawk

Chapter 21 Workbook

210 Populations and Communities

Lesson 1

Scan Lesson 1. Read the lesson titles and bold words. Look at the pictures. Identify three facts that you discovered about populations. Write your facts in your Science Journal.

PopulationsC

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Complete the sentence frame to describe Earth’s biosphere.

Earth’s biosphereincludes

Define population.

Population:

Draw a diagram that shows the relationship between populations in a community. Represent populations with blue circles and the c ommunity with a red box.

Classify each example. Use the terms ecosystem, community, species, and population.

Term Example

Costa Rican rain forest

all the birds that live in Juan Castro Blanco National Park, Costa Rica

scarlet macaws

scarlet macaws that live in Juan Castro Blanco National Park, Costa Rica

The Biosphere and Ecological SystemsI found this on page .

What is a population?I found this on page .

I found this on page .


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Lesson 1 | Populations (continued)C

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Explain competition within a community.

Competition is , such as food, water, and shelter.

Who competes?

individuals within a

all the populations in the

Analyze the effect of environmental changes on populationsize. Complete the cause-and-effect chart.

Cause Effect

Changes in environmental factors:

a.

b.

c.

d.

Define limiting factors, and identify seven factors.

Limiting factor:

Limiting factors:

1.

2.

3.

4.

5.

6.

7.

CompetitionI found this on page .

Population SizesI found this on page .




Lesson 1 | Populations (continued)C

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Describe two ways scientists measure population.

Measuring Population

Capture-Mark-and-Release

Sample Count

Contrast biotic potential and carrying capacity.

Term Description

Biotic potential

Carrying capacity

Analyze how overpopulation can impact a community.

overpopulationin available

population

Analyze It A drought decreases growth of prairie grass. What might happen to the deer population because of the limiting factor of food?






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Lesson 2

Predict three facts that will be discussed in Lesson 2 after reading the headings. Write your facts in your Science Journal.

Changing Populations

How Populations ChangeI found this on page .

Define birthrate and death rate.

Term Definition

Birthrate

Death rate

Analyze how birthrate and death rate can change the size of a population.

IF birthrate > death rate, THEN population .

IF death rate > birthrate, THEN population .

Record the 2 factors that must be present for exponential growth to occur.

1.

2.

Identify four factors that can lead to a population’s decrease in size.

Population Decrease

Give an example of a population decrease you have observed.




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Lesson 2 | Changing Populations (continued)C

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Detail two possible outcomes of a population’s continued decrease in size.

A population’s continued decrease could result in

or

Describe the factors that make a population move to a different location.

Movement

caused by

called

Summarize population changes by identifying the 3 factors that affect human population size.

1.

2.

3.

Analyze the consequences of continued human population growth. Complete the cause-effect chart.

Cause Effect

clearing land for homes, roads, and crops

using energy to grow food, to heat homes, and for transportation



Human Population ChangesI found this on page .



Lesson 2 | Changing Populations (continued)C

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Identify four factors that contribute to an increase in human population growth.

Human birthrate is higher than death rate, so

population .

Describe two factors that can cause a decrease in the human population.

1. Disease:

2. Natural disasters:



Identify the three factors that determine the size of all populations. Explain why there is an increase in the human population.



Lesson 3

Skim Lesson 3 in your book. Read the headings, and look at the photos and illustrations. Identify three things you want to learn more about as you read the lesson. Write your ideas in your Science Journal.

CommunitiesC

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Recall the definition of community.

A community is

.

Identify 4 resou rces that organisms need from a habitat.

1. 3.

2. 4.

Describe the relationship between a habitat and a niche.

The place where an organism lives is its .

The way a species interacts with abiotic and biotic factors to

fulfill needs is its .

Compare how producers and consumers get energy. Then summarize how both types of living things use energy.

Producers Consumers

Both producers and consumers: .

Identify three kinds of consumers.

a. eat .

b. eat .

c. eat and .

Define a food chain.

Food chain:


Communities, Habitats, and NichesI found this on page .



Energy FlowI found this on page .




Lesson 3 | Communities (continued)C

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Analyze the food chain below. Identify the role of each link.

Sun fruit squirrel monkey harpy eagle

Describe a food web.

Ide ntify how populations interact in a community.

Relationship Description

Predator-prey

Cooperative

Symbiotic

3 types:a.

b.

c.



Relationships in CommunitiesI found this on page .

Explain how populations in a community interact.



Review Populations and CommunitiesC

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Chapter Wrap-UpNow that you have read the chapter, think about what you have learned.

Use this checklist to help you study. Complete your Foldables® Chapter Project.

Study your Science Notebook on this chapter.

Study the definitions of vocabulary words.

Reread the chapter, and review the charts, graphs, and illustrations.

Review the Understanding Key Concepts at the end of each lesson.

Look over the Chapter Review at the end of the chapter.

Reread the chapter Big Idea and the lesson Key Concepts. Explain how populations and communities interact and change.

Challenge Find an endangered species list. Choose one species, and research to determine why that species’ population is decreasing. Suggest a plan that could help that species thrive.


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