Respiratory System PCA Student Responses for Item 3:
Gas Exchange in Plants and Animals
Student Response 1
Similarity: One way the process of gas exchange in plants is similar to that in animals is that both plants
and animals “inhale” a type of gas, and both “exhale” another type of gas.
Difference: One way the process of gas exchange in plants is different from that in animals is that plants
don’t have the same type of respiratory system as animals do,, so the don’t actually “breathe.” Instead,
they’re able to absorb it through their bodies. Animals must breathe to exchange gases with the environment.
Total Score Points
Student Response 2
Similarity: They both provide each other with the gas they need
Difference: The plants don’t breath they give off gas molecules. Plants breath carbon dioxe while animals
breathe oxygen
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Student Response 3
Similarity: The way that gas exchangeing in plants and in animals is the same is that they both exchange
gases through the air.
Difference: The difference is that they do not allways exchange some of the same gases.
Total Score Points
Published by the Science Assessment Team of the Washington Office of the Superintendent of Public Instruction on October 3, 2007.
Copyright © 2007 by Washington Office of the Superintendent of Public Instruction (OSPI)
All rights reserved. Educational institutions within the State of Washington have permission to reproduce this document. All other individuals wishing to
reproduce this document must contact OSPI
OSPI Science Assessment
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February 6, 2016
Respiratory System PCA Student Responses for Item 3:
Gas Exchange in Plants and Animals
Student Response 4
Similarity: Plants breathe in carbon dioxide and exhale oxygen, while animals, like us, breathe in oxygen
and exhale carbon dioxide. So the both give to each other.
Difference: The breathe in and out the opposite gases. Plants inhale carbon dioxide and exhale Oxygen.
Animals do the opposite.
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Student Response 5
Similarity: A similarity is the gases that they both need. Both plants and animals need oxygen.
Difference: A difference is the way they exchange the gases. Plants don’t breathe it in, and animals do.
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Student Response 6
Similarity: one way the process of gas exchange in plants is similar to the ones in animals is that they are
both breathing in the same type of air molecules. Although was as humans just need the air that trees produce
, plants and animals must breath air like us too.
Difference: The difference in plant and animal gas exchange is that plants release a different type of air
back to the earth and animals do to. They each are a different form of life and so they need different
substances to stay alive. different air is released back into the air.
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Student Response 7
Similarity: Both animals and plants use something to breath plants breath in what animals breath out
and animals breath in what plants breath out.
Difference: Animals and plants are different plants breath in carbon dioxide and breath out oxegen but
Animals breath in oxagen and breath out carbon dioxide
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OSPI Science Assessment
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February 6, 2016
Respiratory System PCA Student Responses for Item 3:
Gas Exchange in Plants and Animals
Student Response 8
Similarity: The similarity is that the gas keeps animals alive and it allows them to grow. It also
keeps plants alive and lets them grow.
Difference: A difference about gas is that gas does not harm animals and it may harm plants
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Student Response 9
Similarity: Plants and animals both can breathe and grow
Difference: Plants like carbon dioxside and animals have birthdays
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Student Response 10
Similarity: Plants take in carbon dioxide from animals and animals take in oxygen from plants. They
both give off gas for each other.
Difference: They are 2 different gases.
Total Score Points
OSPI Science Assessment
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February 6, 2016