Lesson 2 | Relationships Within Ecosystems



Name Date Class

Chapter 10 LESSON 2

Relationships Within Ecosystems

A. Niches

1. A(n) is the part of an ecosystem that provides an

organism with things it needs to live.

2. Usually many different share a habitat.

3. The way a species interacts with abiotic and biotic factors to obtain food, find

shelter, and fulfill other needs is the of that species.

4. Although two species might share a(n) , no two species

ever share the same .

B. Competition

1. The demand for resources such as food, water, and shelter that are in short supply

in a community describes .

a. Members of the same or different can compete for

the same resources such as food, water, or shelter.

b. limits the size of a(n) ,

sometimes forcing members to leave an area if they are to survive.

2. When a population becomes so large that it causes damage to the environment,

occurs.

a. Individual organisms in an environment for limited

resources, such as food.

b. If organisms facing limitations in their resources cannot move elsewhere, they

might be forced to live too close together, causing the environment to

become .

c. Overpopulation is because organisms eventually

move away, , or die of ;

then the population , and the resources in the

return to their normal levels.

C. Competing with Humans

1. Humans compete with other organisms for biotic and abiotic factors such

as , living , and water.

1 Interactions of Life

Name Date Class

Lesson Outline continued

2. One example of human with other species is diverting

to irrigate crops; another example is cutting down

that serve as shelter for migrating monarch butterflies.

D. Predation

1. An organism that hunts and kills other organisms for food is a(n)

; an organism that is hunted and eaten by another

organism is .

2. The act of one organism, a predator, feeding on another organism, its prey, is

called .

3. A close, long-term relationship between two species that usually involves an

exchange of food or energy is called .

a. is a symbiotic relationship in which both organisms

benefit.

b. is a symbiotic relationship in which one organism

benefits but the other neither benefits nor is harmed.

c. s a symbiotic relationship in which one organism

benefits while the other is harmed.

Interactions of Life 2

Name Date Class

Chapter 10 LESSON 2

Relationships Within Ecosystems

Directions: On the line before each definition, write the letter of the term that matches it correctly. Each term is

used only once.

1. the way a species interacts with abiotic and biotic

factors to obtain food, find shelter, and fulfill

other needs

2. describes interactions between two or more

organisms that need the same abiotic or biotic

factor at the same time

3. occurs when a population becomes so large that it

causes damage to the environment

4. the act of one organism, a predator, feeding on

another organism, its prey

5. a close, long-term relationship between two

species that usually involves obtaining food or

energy

6. a symbiotic relationship in which both organisms

benefit

7. a symbiotic relationship in which one organism

benefits and the other does not benefit and is not

harmed

8. a symbiotic relationship in which one organism

benefits while the other is harmed

A. commensalism

B. competition

C. mutualism

D. niche

E. overpopulation

F. parasitism

G. predation

H. symbiosis

Interactions of Life 3

Name Date Class

Chapter 10 LESSON 2

Relationships Within Ecosystems

Directions: Use the diagram to answer each question or respond to each statement on the lines provided.

1. What does the black horizontal line on the graph represent?

2. What part of the graph shows overpopulation? Shade the area on the graph.

3. What happens to resources when a species reaches overpopulation?

4. What can happen to a species when it reaches overpopulation?

5. Is overpopulation permanent? Explain.

4 Interactions of Life

Name Date Class

Chapter 10 LESSON 2

Relationships Within Ecosystems

Key Concept In what ways can organisms interact in an ecosystem?

Directions: Label the type of symbiosis shown in each illustration. Then write a caption explaining the relationship

between the organisms shown in each illustration.

|Type of symbiosis: |Type of symbiosis: |Type of symbiosis: |

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|Caption: |Caption: |Caption: |

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Interactions of Life 5

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Lesson Outline

Content Practice A

Content Practice B

Key Concept Builder

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