Grade 7 Science Chapter 1 Review
Name: _______________________
Modified True/False
Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true.
____
1. People are not plants or animals, so people are not part of any ecosystem.
_____________________________________________________________________
____
2. A species is a group of organisms that can successfully mate with each other and reproduce.
_____________________________________________________________________
____
3. Humans are not animals, so humans do not have the same basic needs as other animals in an
ecosystem.
_____________________________________________________________________
____
4. The soil under a rock could be described as an earthworm’s niche.
_____________________________________________________________________
____
5. One hundred species are identified in a small pond. The loss of one of those species will have very
little effect upon the pond ecosystem.
_____________________________________________________________________
____
6. Frogs, snails, geese, and sticklebacks could be found in an ocean ecosystem in Newfoundland and
Labrador.
_____________________________________________________________________
____
7. The following organisms can be found in the Newfoundland and Labrador region: green frogs,
mushrooms, polar bears, ospreys, and seals.
____________________________________________________________________
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8. When we study and ecosystem, we study only the biotic parts of the ecosystem.
_____________________________________________________________________
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9. Many individuals of the same species living together are called a community.
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____ 10. An ecological niche is the set of jobs or roles that an individual fills in an environment.
_____________________________________________________________________
____ 11. Most humans are comfortable between 20°C and 25°C because it is within their niche.
_____________________________________________________________________
____ 12. Mushrooms and micro-organisms are neither plants nor animals; they can be described as abiotic
factors.
_____________________________________________________________________
____ 13. Air, water, and rocks are essential to life, and can be described as biotic factors.
_____________________________________________________________________
____ 14. The webbed feet of a duck are biotic factors to help the duck survive and live in its environment.
_____________________________________________________________________
Completion
Complete each statement.
15. All of the interacting organisms that live in an environment, as well as the abiotic parts of the
environment that affect these organisms, is called a(n) ____________________.
16. A(n) ________________ of organisms is a group of interacting populations.
17. A group of organisms that can successfully mate with each other and reproduce is called a(n)
__________________.
18. Food, water, and shelter make up an organism’s ____________________.
19. The water in a pond ecosystem is a(n) __________ factor while the insects represent a(n)
__________ factor.
20. The ways in which a mosquito obtains its food and affects its environment are called its
__________.
21. A single caribou is considered a(n) _____________. Many caribou living together in an area are
considered a(n) ______________.
22. Many insects die in the winter because of the cold temperatures. For such insects, a temperature of
–15°C is outside of their ____________________.
23. From smallest to largest, the four levels of ecological organization are _____________,
_____________, _____________, and _____________.
24. Every species inherits specific ____________ to help it survive in its environment.
25. Water, sunlight, and air are __________ parts of an environment.
26. “The deep roots of shore grasses provide stability and access to water in sandy soils.” These
characteristics are known as _____________.
27. Living things that animals eat, such as worms and bugs, are examples of __________ factors.
28. Many individuals of one species together in one area at the same time form a(n) _______________.
Matching
Match the correct term to each of the following definitions. Each term may only be used once.
a. abiotic
g. range of tolerance
b. biotic
h. community
c. ecosystem
i. individual
d. organism
j. niche
e. habitat
k. population
f. adaptation
l. species
____ 29. the abiotic conditions within which an organism can survive
____ 30. the non-living parts of an environment
____ 31. the interacting biotic and abiotic parts of an environment
____ 32. the characteristics that help an organisms survive in its environment
____ 33. the particular place where an organisms lives
____ 34. a single organism
____ 35. a group of organisms of the same species living together in one ecosystem
____ 36. a living thing
____ 37. the role played by an organism in an ecosystem
____ 38. a group of organisms that can successfully mate with one another
____ 39. a group of all the interacting populations that live in an area
____ 40. the living parts of an environment
Identify each part of the environment as abiotic or biotic. Each term may be used more than once.
a. abiotic
b. biotic
____ 41. air
____ 42. trees
____ 43. water
____ 44. worms
____ 45. grasses
____ 46. minerals
____ 47. nutrients
____ 48. light
Short Answer
49. Identify three biotic parts of the environment shown in the picture below.
50. Organisms and their interactions with the abiotic parts of their environment can be organized into
four different levels, as shown in the diagram. What are the four levels?
51. While watching a video of the tundra in the Arctic, a student says “There is no habitat in this
ecosystem.” Is this statement true? Illustrate your explanation with some examples.
52. The residents of a community are tired of the hares eating plants from their gardens. You would like
to convince residents not to remove all of the hares that live in the area. What four points might you
make?
53. Explain why plants do not grow at the bottom parts of deep ocean areas.
54. Explain why the trees of Labrador are smaller than trees of the same species found in
Newfoundland.
55. Explain what would happen to an Atlantic cod if it was placed into a freshwater pond.
56. Describe the biotic and abiotic parts of soil.
Essay
57. Explain why a rotting tree on the forest floor is an example of a small ecosystem.
Grade 7 Science Chapter 1 Review
Answer Section
MODIFIED TRUE/FALSE
1. ANS: F
People are animals, so people are part of ecosystems. Humans have the same basic needs as all
other living things.
2. ANS: T
3. ANS: F
Humans are animals, so humans do have the same basic needs—food, water, air, and shelter—as
other animals.
4. ANS: F
The soil under a rock could be described as an earthworm’s habitat.
5. ANS: F
The loss of one of those species will have a considerable effect upon the pond ecosystem. Every
species has a role to play within an ecosystem. It interacts with other species and the abiotic parts of
the ecosystem. When one species disappears completely, the many other populations will certainly
change, and some others may actually disappear.
6. ANS: F
Frogs, snails, geese, and sticklebacks could be found in a freshwater ecosystem in Newfoundland
and Labrador.
7. ANS: T
8. ANS: F
There are biotic and abiotic parts in an ecosystem; we must study both of them.
9. ANS: F
Many individuals of the same species living together are called a population.
10. ANS: T
11. ANS: F
Most humans are comfortable between 20°C and 25°C because it is within their range of tolerance.
12. ANS: F
Mushrooms and micro-organisms are neither plants nor animals; they can be described as biotic
factors.
13. ANS: F
Air, water, and rocks are abiotic factors. They are a - biotic, or “not - living”.
14. ANS: F
The webbed feet of a duck are adaptations to help the duck survive and live in its environment.
COMPLETION
15. ANS: ecosystem
16. ANS: community
17. ANS: species
18. ANS: habitat
19. ANS: abiotic; biotic
20. ANS:
niche
ecological niche
21. ANS: individual; population
22. ANS: range of tolerance
23. ANS: individual, population, community, ecosystem
24. ANS: adaptations
25. ANS: abiotic
26. ANS: adaptations
27. ANS: biotic
28. ANS: population
MATCHING
29.
30.
31.
32.
33.
ANS:
ANS:
ANS:
ANS:
ANS:
G
A
C
F
E
34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
45.
46.
47.
48.
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
I
K
D
J
L
H
B
A
B
A
B
B
A
A
A
SHORT ANSWER
49. ANS:
Responses will vary. Any three of:
• grass
• shrubs
• trees
• birds
• moose
• micro-organisms
50. ANS:
The four levels are individuals, populations, communities, and ecosystem.
51. ANS:
No. Although the tundra is very harsh, it is the habitat to such hardy organisms as lichens and
mosses. The lichens and mosses provide habitat for other organisms, such as small plants, insects,
birds and lemmings.
52. ANS:
Students may include any reasonable points such as:
• Hares are part of the ecosystem.
• The hares may be the prey for other species.
• Eliminating one part of the ecosystem would be harmful to the rest of the ecosystem.
• It would be better to “hare-proof” gardens by laying chicken wire on the ground around the garden
(hares will not be able to get in).
• Residents should allow scientists time to study the reasons for an increase in the population before
doing anything.
53. ANS:
Student answers may vary. One possible answer is:
Deep ocean areas do not receive enough sunlight and therefore can’t make food by the process of
photosynthesis.
54. ANS:
Student answers may vary. One possible answer is:
The colder temperatures cause a slower rate of growth. A shorter growing season causes less wood
to form in each year. Less water and nutrients reduce the growth even further.
55. ANS:
Student answers may vary. One possible answer is:
The Atlantic cod would not survive in the freshwater pond because it is not adapted to freshwater.
The extremely low level of dissolved salts in the pond water would be outside the lower limits of the
cod’s range of tolerance for salinity.
56. ANS:
Student answers may vary. One possible answer is:
Soil itself is not biotic but contains decaying organic matter, living organisms, and bacteria. Soil also
contains water, oxygen, minerals, and various types of rocks.
ESSAY
57. ANS:
Student answers may vary. One possible answer is:
Organisms use the rotting tree for food, shelter, and protection. Some organisms living in the rotting
tree may never venture beyond this small area because the rotting tree provides them with everything
they need to live.