Evolution ACORNS item #02


Q.

A species of cactus has spines. How would biologists explain how a species of cactus with spines evolved from an ancestral cactus species without spines?

Audiences:

Undergraduate

Special Instructions

We recommend that you administer these questions as homework and preface the question with these instructions for students:

"For the following question, please respond to the best of your knowledge and using only the information in the question and what you know. Please do not refer to any outside sources (textbooks, notes, internet, etc.). Any reasonable attempt to answer the question will be awarded full credit."

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Background Information

Developed by: R. Nehm's group as part of the ACORNS instrument.

This item has been developed to analyze students' written explanations of evolutionary change.  This item can be used to elict responses which can be scored for nine standards-based concepts.  Analysis of responses to this item can also provide information about general student reasoning models.

For more information about the assessment instrument or analysis of this item, visit: www.evograder.org

 


Question Instructions

We recommend that you administer these questions as homework and preface the question with these instructions for students:

"For the following question, please respond to the best of your knowledge and using only the information in the question and what you know. Please do not refer to any outside sources (textbooks, notes, internet, etc.). Any reasonable attempt to answer the question will be awarded full credit."

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