Lesson 1 | Ecosystems
Name Date Class
Chapter 10 LESSON 1
Ecosystems
Directions: Write the correct term in the boxes to the right of each clue. Then unscramble the letters in the
shaded boxes to spell an eighth term.
|abiotic factor |atmosphere |biotic factor |community |
|ecosystem |habitat |population |population density |
1. all of the ants in a park, for example
2. [pic] for example
3. sunlight or water, for example
4. consists of multiple populations
5. made up of the main components of
nitrogen, oxygen, and carbon dioxide
6. a tree or a dead organism, for example
7. includes all of the living and nonliving
parts of the environment in an area
8. When unscrambled, the letters in the shaded boxes spell
, which is the place where an organism lives.
Interactions of Life 1
Name Date Class
Chapter 10 LESSON 1
Ecosystems
A. What is an ecosystem?
1. All the living things and nonliving things in a given area form
a(n) .
2. factors are the nonliving parts of an ecosystem; they
provide that organisms need to survive and reproduce.
a. Sunlight is an important factor because it supplies
for photosynthesis; this process results in the
production of .
b. Sunlight also provides warmth affecting an
ecosystem’s .
c. The atmosphere includes that living things need,
including , oxygen, and
dioxide.
d. is an abiotic factor that is essential for all life
processes that take place in cells, such as photosynthesis and
respiration.
e. Soil is a(n) factor that includes a biotic part called
, which is made up of decayed remains of plants and
animals; soil that is usually has a high humus content.
3. factors are the living or once-living things in an
ecosystem.
B. Habitats
1. The place within an ecosystem that provides food, water, shelter, and other biotic
and abiotic factors an organism needs to survive and reproduce is the
organism’s .
2. Animals have a variety of depending on time of day,
season, or availability of specific resources.
3. Plants have habitats that depend on factors, such as
amount of water or sunlight that is usually available.
2 Interactions of Life
Name Date Class
Lesson Outline continued
4. can disappear if there is a significant change in
biotic or abiotic in an ecosystem; wildfires,
, and flooding are examples of changes that can
habitats.
C. Populations
1. The group that includes all the organisms of the same species that live in the same
area at the same time is known as a(n) ; for example,
all the grass in a vacant lot forms a plant .
2. A(n) is made up of all the populations living in
the same area at the same time; for example, of pigeons,
dandelions, and grasses are part of a vacant-lot community.
3. Overcrowding affects the size of a population because it leads to
and .
a. The size of a population compared to the amount of space available is called the
; it is calculated by dividing the number of
in the population by unit area or volume of space
where the population lives.
b. If a place has a(n) population density, organisms
often live so close together that they aren’t able to get all the
they need to survive; this also allows
to spread more easily, decreasing organisms’ survival.
4. Populations increase when the number of is larger than
the number of .
5. Changes in the biotic and abiotic factors in an ecosystem can force organisms to
die out or to .
Interactions of Life 3
Name Date Class
Chapter 10 LESSON 1
Ecosystems
Directions: Complete the crossword puzzle with the correct terms from the word bank.
|abiotic factor |biotic factor |community |
|ecosystem |habitat |population density |
Across
3. all the living and nonliving things in
the environment in a given area
4. the area within an ecosystem that
provides food, water, shelter, and other
biotic and abiotic factors an organism
needs to survive and reproduce
6. a nonliving part of an ecosystem
Down
1. all the populations living in an
ecosystem at the same time
2. the size of a population compared to
the amount of space available
5. a living or once-living thing in an
ecosystem
Interactions of Life 4
Name Date Class
Chapter 10 LESSON 1
Ecosystems
Key Concept What are the similarities and differences between the abiotic and biotic parts
of an ecosystem?
Directions: On the line before each term, write A if the term represents an abiotic factor or B if the term represents
a biotic factor.
1. bacteria
2. soil
3. fallen leaves
4. plants
5. sunlight
6. water
7. decayed animal matter
8. animals
9. atmosphere
Directions: Answer each question on the lines provided.
10. What are abiotic factors?
11. What are biotic factors?
12. How are abiotic factors and biotic factors alike? How are they different?
5 Interactions of Life
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Content Vocabulary
Lesson Outline
Content Practice A
Key Concept Builder
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