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7th Grade Unit 1Review
The plants on Earth are said to be producers, or autotrophs. They make their own
food in the process called photosynthesis. Use the diagram to answer the following
questions.
1. The plant takes in ___________________________that is chemically changed
into __________________________.
2. During photosynthesis ______________energy is transformed into
____________energy.
3. The purpose of photosynthesis is to convert radiant energy into an energy source
that can be used by _______________and provide _____________to the
atmosphere which is necessary for animal life.
Most of the energy that enters an ecosystem comes from the sun. Some of this
energy is converted into chemical energy that moves through the ecosystem by way
of food chains. The amount of available energy decreases as it moves through the
chain.
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4. Use the information to complete the energy pyramid.
Organism
Herring
Polar bear
Harp seals
Phytoplankton
5. Use
A.
B.
C.
D.
Energy Source
Consumes plants and plant material
Top consumer
Predator of small fish
photosynthesis
the coding system listed below to color code the energy pyramid.
Secondary consumers (yellow)
Producers (green)
Tertiary consumers (blue)
Primary consumers (red)
6. Which level on the energy pyramid has the greatest amount of energy to be
transferred?________________________
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5. Use the food web above to make 2 complete food chain diagrams.
Organic Compounds
The chemical compounds of living things are known as organic compounds because
of their association with organisms.
6. What are the most common elements found in organic compounds?
_________________________________________________________________
7. Which two elements must bond in order for the compound to be considered
organic? ______________________________________
8. Circle the organic compounds.
C12H8
C12H8
H2O
H2SO4
C20H30O2
CO2
CH4
CH4O
Habitable Planet
A habitable planet is one that provides the elements needed for life to exist.
9. In order for an object in space to support life, _____________________ must be
present.
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10. What other components must be present for an environment to be habitable?
Cycling of Matter
Matter, such as carbon dioxide, water, oxygen, and nitrogen, moves in cycles
through the environment. This matter gets used over and over again.
10. What is being cycled through the environment in the diagram above?
___________________________________________________________
11. There are three important processes that take place during this cycle. Each letter
(A, B, C) on the diagram represents a process in the cycle. Name and describe the
processes.
A__________________________________________________________________
___________________________________________________________________
B__________________________________________________________________
___________________________________________________________________
C__________________________________________________________________
___________________________________________________________________
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Use the information in the reading below to answer question 12-13.
Observing a compost bin allows you to observe nature recycle leaves, grass,
vegetable peels, etc. Decomposers, like bacteria and fungi, breakdown the decaying
matter.
12. Why is this process important in nature?
13. What is being cycled?
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