Lesson 1 | Populations
Name Date Class
LESSON 1
Populations
Directions: Replace the underlined words with the correct term from the word bank below. NOTE: You may need
to change a term to its plural form.
|biosphere |biotic potential |carrying capacity |community |
|competition |limiting factor |population |population density |
1. You and all other living things inhabit the parts of Earth
and the surrounding atmosphere where there is life.
2. Mammals, insects, birds, grasses, trees, shrubs, and other
organisms can be part of the same group of different
species that live in the same area at the same time.
3. The fewer the available resources are, the greater the
struggle for the same resources is within a community.
4. Because their predators are no longer abundant, there are
large groups of the same species of deer in many regions
of North America.
5. Because resources are always limited, no population will
ever reach its maximum production of offspring with no
limiting factors.
6. Temperature and availability of water, food, shelter, and
sunlight are things that can restrict the size of a
population.
7. The size of a population compared to the amount of space
available can be estimated with a sample count.
8. A population typically stops growing when it is at the size
of the largest number of individuals that an environment
can support.
Populations and Communities 9
Name Date Class
LESSON 1
Populations
Key Concept What defines a population?
Directions: Put a check mark in the space that correctly identifies each description.
|Description |Population |Community |Ecosystem |Biosphere |
|1. The parts of | | | | |
|Earth and Earth’s | | | | |
|atmosphere | | | | |
|where there is life | | | | |
|2. All the organisms | | | | |
|of the same | | | | |
|species that live | | | | |
|in the same area | | | | |
|at the same time | | | | |
|3. All the organisms | | | | |
|and the nonliving | | | | |
|parts of the | | | | |
|environment in | | | | |
|an area | | | | |
|4. All the different | | | | |
|species that live | | | | |
|in the same area | | | | |
|at the same time | | | | |
Directions: Answer each question or respond to each statement on the lines provided.
5. A species is a group of organisms that have similar traits and are able to produce fertile
offspring. What is meant by the term fertile offspring?
6. How can two individuals in the same species not be in the same population?
Name Date Class
LESSON 2
Changing Populations
Directions: On each line, write the term from the word bank that correctly completes each sentence. Each term is
used only once.
|birthrate |carrying capacity |death rate |decrease |
|endangered species |exponential growth |extinct species |increases |
|migration |movement |threatened species | |
1. The number of offspring produced over a given time period is a population’s
; the number of individuals that die over that time is
its .
2. If the birthrate is higher than the death rate, the population
in size.
3. A population grows in a pattern called when it is in ideal
conditions with abundant resources.
4. Lack of food, natural disasters, disease, and predation are reasons why a population
might in size.
5. When no individuals are left of a species, it is called a(n) .
6. A(n) is a species whose population is at risk of extinction.
7. A(n) is a species that is at risk but is not yet endangered.
8. The instinctive seasonal movement of a population of organisms from one place to
another is called .
9. Changes in the human population size are caused by birthrate, death rate,
and .
10. Humans have developed ways to increase the of their
environment.
30 Populations and Communities
Name Date Class
LESSON 3
Communities
Directions: Use the clues and the terms listed below to complete the puzzle. Unscramble the letters in the vertical
box to spell a ninth term.
| | |
| | |
| | |
| | |
| | |
1. an organism that survives by hunting
2. a relationship that benefits both species involved
3. an organism that makes its own food, using energy from the environment
4. a relationship that benefits one species but does not harm or benefit the other
5. a close relationship between two species that involves an exchange of energy
6. the place where an organism lives
7. what a species does in its habitat to survive
8. an organism that eats other organisms
9. The letters in the vertical box spell , which is a relationship
that benefits one species and harms the other.
46 Populations and Communities
Name Date Class
LESSON 3
Communities
Directions: On the line before each definition, write the letter of the term that matches it correctly. Each term is
used only once.
1. all the species that live in the same ecosystem at
the same time
2. the place within an ecosystem where an organism
lives
3. what a species does in its habitat to survive
4. an organism that gets energy such as sunlight
from the environment and makes its own food
5. an organism that gets energy by eating other
organisms
6. a way of showing how energy moves through a
community
7. an animal that hunts other animals for food
8. an animal that is hunted
9. a close relationship between two species that
involves an exchange of energy
10. a symbiotic relationship in which both partners
benefit
11. a symbiotic relationship that benefits one species
but does not harm or help the other
12. a symbiotic relationship that benefits one species
and harms the other
A. niche
B. symbiosis
C. producer
D. community
E. parasitism
F. habitat
G. food chain
H. consumer
I. prey
J. mutualism
K. predator
L. commensalism
50 Populations and Communities
Name Date Class
LESSON 3
Communities
Key Concept What defines a community?
Directions: Put a check mark under the column(s) that each item describes.
|Description |Habitat |Niche |
|1. The place within an ecosystem where an organism lives | | |
|2. Provides the resources an organism needs | | |
|3. The ways an organism uses resources | | |
|4. Shared by many species of organisms | | |
|5. Usually unique to a species | | |
|6. Helps species survive | | |
Directions: Respond to each statement on the lines provided.
7. Write a definition of community.
8. Explain how it is possible for different species to survive in the same habitat.
9. Identify two organisms that have different niches in the same habitat.
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Content Vocabulary
Key Concept Builder
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