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Science 7
Interactions and Ecosystems Unit Test
Choose the BEST answer for each question and place your answer on the ANSWER
SHEET.
1. A product of photosynthesis is
a. Water
b. Glucose (sugar)
c. Starch
d. Carbon dioxide
2. Which of the following is NOT an abiotic factor?
a. Sunlight
c. Tree branch
b. Rock
d. Oxygen
3. A species that is in serious danger of not being found anywhere on Earth is
defined as
a. Extinct
c. Endangered
b. Extirpated
d. Threatened
Use the following words to answer the next 3 questions:
A. Commensalism
B. Mutualism
C. Parasitism
D. Predation
4. A kind of bird called the oxpecker eats harmful ticks, a meal they enjoy, that live
on the skin of a hippopotamus. This is an example of _____.
5. Hawks build their nest on a cactus. The cactus is not harmed. This is an example
of ___.
6. The velvet mite is a plant organism that harms or kills its host. This is an example
of ___.
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Use the following information provided to answer the next question:
The following numbers represent the sequence of succession.
I. The soil layer thickens and can hold more water. Grasses and flowering weeds
take root and grow.
II. Mosses and ferns grow in poor, thin soil, slowly replacing the lichen.
III. Bushes and trees take root in thicker and richer soil. They provide shelter and
food for birds, mammals, and other organisms.
IV. Lichens produce acids that help break down rock. The broken-down rock and
the decomposing bodies of dead lichen contribute to soil formation.
7. Which is the correct order for the events of succession?
a. I, II, III, IV
c. I, III, IV, II
b. VI, III, II, I
d. IV, II, I, III
8. All living things exchange gases. Plants use _________________ to make food
and release _____________ to the environment.
a. Carbon dioxide, carbon dioxide
c. Oxygen, carbon dioxide
b. Carbon dioxide, oxygen
d. Oxygen, oxygen
9. The rainforest is being cut down at an alarming rate. People around the world are
concerned about this loss of forest because it could have a profound effect on the
quality of the air, one of our basic needs. Which of the following best describes
how cutting down the rain forest will affect the air?
a. There will be an increase in the oxygen content of the air.
b. There will be a decrease in the carbon dioxide content of the air.
c. There will be a decrease in the oxygen content in the air.
d. There will be no change.
10. Adaptations are inherited characteristics that help an organism to survive and
reproduce in its environment. Looking both ways before crossing a street helps us
survive but is not an adaptation because it is ...
a) inherited from our parents
b) learned through experience
c) a survival adaptation
d) an inherited survival experience
11. A salamander hides under the bark, fungi grows on the rotting log and other forest
dwelling organisms use the hollow core as a home. This rotting decaying log is an
...
a) environment
b) habitat
c) environmental footprint
d) ecosystem
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12. Which of the following is a basic human need?
a) Telephone
b) Water
c) Pop
d) Air conditioning
13. Which term describes the second link in any food chain?
a) Consumers
b) Prey
c) Producers
d) Predator
14. Which term identifies organisms that break down waste material and dead
animals to release energy?
a) Consumers
b) Producers
c) Scavengers
d) Decomposers
15. Which best describes a predator that eats almost anything when food is scarce?
a) Herbivore
b) Scavenger
c) Producer
d) Prey
16. The three types of consumers are:
a) Producer, predator, and prey
b) Carnivore, predator, and prey
c) Herbivore, omnivore, and carnivore
d) Herbivore, omnivore, and producer
17. A species that makes its own food source is called a(n):
a) Producer
b) Consumer
c) Herbivore
d) Photosynthesis
18. Ecosystem monitoring monitors which parts of the environment?
a) Abiotic parts only
b) Biotic parts only
c) Abiotic and biotic parts
d) Plants, birds and butterflies only
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19. Frogs and toads are very sensitive to environmental change. They are known as
a) Indicator species
b) Adapted species
c) Environmental monitoring species
d) Abiotic species
20. If scientists want to monitor change over many years in an ecosystem, what do
they gather as a starting point?
a) Biological controls
b) Fossils
c) Indicator species
d) Baseline data
21. Which term refers to the gradual process by which some species replace other
species in an ecosystem?
a) Species replacement
b) Succession
c) New growth
d) Habitat loss
22. Which term best describes an animal that eats both plants and animals?
a) Herbivore
b) Carnivore
c) Decomposer
d) Omnivore
23. Scientists gather data to learn how human activities may affect the environment.
What do scientists prepare from the data?
a) Permanent plot diagrams
b) Baseline data graphs
c) Environmental impact assessments
d) Plant information lists
24. What kind of area might undergo secondary succession?
a) Bare lifeless rock
b) Burned forests
c) Grasslands
d) Cold desserts
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25. Food chains and food webs are models in science which visually show us the
different relationships within an ecosystem. The primary difference between the food
chain and the food web is:
a) a food chain shows how energy is stored
b) a food web shows how energy is used
c) a food web is a complex system of food chains
d) a food chain is a combination of different food webs
26. Carbon is an integral part of an ecosystem. It is cycled throughout the ecosystem as it
is used and then reused. It is necessary for all life to exist. Carbon is used by plants in the
process of ...
a) Respiration
b) Photosynthesis
c) Transpiration
d) Decomposition
Use the following diagram to answer the next questions
27. This illustration shows a food chain that has been exposed to mercury spill. Which
component of the food chain has the lowest concentration of mercury?
a)
b)
c)
d)
Each component will be exposed to the same concentration of mercury
Micro-organisms
Humans
Large fish
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28. The process by which poisons concentrate as they move through the food chain is
called:
a) DDT
b) Pyramid of numbers
c) Bioaccumulation
d) Acid rain
29. Another very important cycle is the Water Cycle. All living things need water to live.
This cycle has four main processes. The two processes that return water to the earth
are …
a) evaporation and condensation
b) condensation and precipitation
c) transpiration and condensation
d) evaporation and transpiration
30. The process in which water, in the water cycle, goes through a phase change, from a
gas to a liquid, is called ...
a) Evaporation
b) Transpiration
c) Condensation
d) Precipitation
31. Adapting to change is easier for some species than for others. A bushy-grassland area
was cleared to make room for a new housing development, in a city suburb. The original
area was home to many species that thrived. The species likely to adapt most easily to the
new habitat was ...
a) Rabbit
b) Fox
c) Coyote
d) Wolf
32. Biological control is used to control pests. Unfortunately there are risks involved if
the biological control is a new species to the area. The reason for this is because it ...
a) might not have enough food to survive
b) may get killed off more quickly than expected
c) has no natural predators, so it may overpopulate the area
d) could restore the balance and be ineffective
33. The aftermath of the Mt. St. Helen's Volcano eruption in 1980, was monitored to see
just how quickly spiders would return to the area. This type of monitoring is called ...
a) Physical
b) Environmental
c) Chemical
d) Biological
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34. An ecosystem thrives with biotic and abiotic component parts. An example of an
abiotic part of an ecosystem is ...
a) micro-bacteria
b) fungus
c) water
d) decaying plants
35. The water that travels underground towards rivers, streams, lakes and oceans is called:
a) Run off
b) Ground water
c) Mineral water
d) Dissolved carbon
Use the following information to answer the next two questions:
A scientist has made a quadrat sample area of 5 m2 and has noted these organisms; mice,
grasshoppers, grass, rabbits, coyotes, deer and wheat.
36.If this scientist was creating a pyramid of numbers using his collected data which
organisms would be at the base of his diagram?
a) Deer and rabbits
b) Grasshoppers and grass
c) Grass and wheat
d) Coyotes and mice
37. The top of the pyramid would have this organism:
a) Grass
b) Mice
c) Rabbits
d) Coyote
38. In a food chain the greatest amount of energy is stored in :
a) Producers
b) Consumers
c) Predators
d) Prey
39. Decomposers are essential to the survival of all living things within an ecosystem
because they:
a) Delay decay in living things
b) Provide a food source for small animals
c) Provide oxygen that is necessary for survival
d) Recycle mineral necessary for survival
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40. This type of ecosystem monitoring assesses the quality of air, soil and water.
a) Chemical
b) Environmental
c) Physical
d) Biological
Good luck!
Please write on the back what your preparations were (how did you
study) for this test. Then we can see if the strategies you used
were helpful or if you need some tips!