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Unit B, Chapter 2 ~ Living Things Interact
Lesson 1: Ecosystems (pgs. B28-B31)
Vocabulary
Meaning
Word
individual
population
community
ecosystem
habitat
niche
1
Unit B, Chapter 2
Organisms and Their Environment (B28)
Habitats and Niches (B29)
Limiting Factors (B30)
2
Unit B, Chapter 2
Lesson 1 Review Questions (B31)
1. What is the relationship of a population to a community?
2. What is an ecosystem?
3. Use the data on page B30. How much warmer is it in June in the southern
Arizona desert ecosystem than it is in the forest ecosystem of southern
Vermont?
4. The environment determines the ecosystem of an area. What things in the
environment where you live determine your local ecosystem?
5. Nonliving things that affect the organisms living in an ecosystem include
weather, landforms, and _____.
a. habitat
b. niche
c. soil
d. population
3
Unit B, Chapter 2
Lesson 2 : How Energy Is Transferred in an Ecosystem (pgs. B34-B39)
Vocabulary
Meaning
Word
producer
consumer
food chain
decomposer
food web
energy
pyramid
4
Unit B, Chapter 2
Living Things Need Energy (B34)
Food Chains (B35)
A Prairie Food Web (pg. B36-B37)
Energy Pyramids (B38)
5
Unit B, Chapter 2
Lesson 2 Review Questions (B39)
1. In most ecosystems, what kinds of organisms are producers?
2. What benefit do decomposers provide for an ecosystem?
3. What is an organism that eats another organism called?
4. Think of three things you like to eat. What level consumer are you for each
of the foods you chose?
5. Organisms at the bottom of an energy pyramid are always ___.
a. plant eaters
b. producers
c. hunters
d. scavengers
6
Unit B, Chapter 2
Lesson 3: Ways in Which Organisms Compete (B42-B47)
Vocabulary
Meaning
Word
competition
symbiosis
instinct
learned
behavior
Competition for Limited Resources (B42-B43)
7
Unit B, Chapter 2
Sharing Resources (B43-B44)
Symbiosis (B45)
Instincts and Learned Behaviors (B46)
8
Unit B, Chapter 2
Lesson 3 Review Questions (pg. B47)
1. Why does a female sea turtle lay more than a thousand eggs at a time?
2. How might the number of oak trees in a park affect the number of squirrels
that can live there?
3. What resources are sometimes shared by squirrels and certain birds?
4. Think of an animal that lives in your area. What behaviors does it have for
survival?
5. Which of the following is NOT a survival instinct for birds?
a. building nests
b. migrating
c. eating insects
d. learning to talk
9
Unit B, Chapter 2
Lesson 4: Extinction and Its Causes (pgs. B50-B53)
Vocabulary
Meaning
Word
exotic
extinct
endangered
threatened
Population Decline (B50)
10
Unit B, Chapter 2
Extinction Is Forever (B51)
Success Stories (B52)
Lesson 4 Review Questions (B53)
1. Name a natural cause of decline in a population.
2. How is a threatened organism different from an endangered one?
3. How many living individuals are there in a population that is extinct?
11
Unit B, Chapter 2
4. Think of an animal or plant in your state. What changes in the environment
could cause it to become threatened or endangered? Give specific
examples.
5. It is impossible for an endangered organism to recover if ___.
a. its habitat is restored
b. its population is too small
c. hunting is stopped
d. it is bred in captivity
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Unit B, Chapter 2