Snail and Elodea, a High School Systems Scenario
Snail and Elodea
High School
Systems Scenario
DRAFT – Seattle Public Schools Science Instructional Services, jbfox@seattleschools.org
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Spring 2012
Snail and Elodea, a High School Systems Scenario
Snail and Elodea
Directions: Use the following information to answer questions 1 through 6 on pages 3 through 6.
Students analyzed elodea, a plant that lives and grows in water. They made the following diagram.
Elodea System
DRAFT – Seattle Public Schools Science Instructional Services, jbfox@seattleschools.org
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Spring 2012
Snail and Elodea, a High School Systems Scenario
1 What energy transformation occurs when the elodea plant absorbs energy from the lamp? (LS1A,1)
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A. Heat energy is transformed to nuclear energy.
B. Light energy is transformed to chemical energy.
C. Kinetic energy is transformed to chemical energy.
D. Electrical energy is transformed to nuclear energy.
2 What process causes carbon dioxide to be released by living organisms? (LS1B, 3)
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A. Minerals being taken in from the soil
B. Water being used as a source of energy
C. Food being broken down to provide energy
D. Oxygen being absorbed during photosynthesis
3 Specific organelles in the elodea plant cell perform photosynthesis. Which organelle in the elodea is the site
of photosynthesis? (LS1C)
Write your answer in the box.
DRAFT – Seattle Public Schools Science Instructional Services, jbfox@seattleschools.org
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Spring 2012
Snail and Elodea, a High School Systems Scenario
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Describe how the elodea plant uses energy from the lamp and matter from the environment to live and
grow. (LS1A)
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In your description, be sure to:
Identify two types of matter the plant takes in from the environment.
Describe the process in the plant that uses this matter and the energy from the lamp to live
and grow.
You may use words, labeled pictures, and/or labeled diagrams in your answer.
Types of matter:
Process in the plant:
DRAFT – Seattle Public Schools Science Instructional Services, jbfox@seattleschools.org
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Spring 2012
Snail and Elodea, a High School Systems Scenario
5 The cells of the elodea plant, like all living organisms, contain special proteins called enzymes. How do the
cells obtain these proteins? (LSIE, 7 – too easy?)
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A. The cells make the proteins using instructions in the genes.
B. The proteins are absorbed from the water by cells in the leaves.
C. The energy from the lamp changes molecules in the cells into proteins.
D. The proteins are all present in the plant seed before the seed germinates.
6 Gas bubbles are produced by the elodea when a lamp shines on the plant. What substance is the gas in the
bubbles? (LS1A, 1)
Write your answer in the box.
7 Example of feedback loop in plants. What type of feedback happens when…? (SYSA, 3-4)
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A. Positive feedback, because….
B. Positive feedback, because.
C. Negative feedback, because...
D. Negative feedback, because...
DRAFT – Seattle Public Schools Science Instructional Services, jbfox@seattleschools.org
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Spring 2012
Snail and Elodea, a High School Systems Scenario
8 Cellular respiration and the burning of fossil fuels both are chemical processes. (LS1B, 2)
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Describe one way the chemical process in cellular respiration is similar to the process of the burning of
fossil fuels.
Describe one way the chemical process in cellular respiration is different the process of the burning of
fossil fuels.
Similarity:
Difference:
DRAFT – Seattle Public Schools Science Instructional Services, jbfox@seattleschools.org
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Spring 2012