what keys do you know about? episd middle school science standards based curriculum 2015-2016
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What keys do you know about?
EPISD Middle School Science Standards Based Curriculum 2015-2016
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Dichotomous Keys are:
•hierarchical•mutually exclusive• exhaustive
EPISD Middle School Science Standards Based Curriculum 2015-2016
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Mutually Exclusive
• There are only two choices • If it is in one group, it cannot be in another
• Example:– Organism has a hard exoskeleton– Organism has a hard endoskeleton
The organism cannot have both a hard exoskeleton and a hard endoskeleton.
EPISD Middle School Science Standards Based Curriculum 2015-2016
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Hierarchical
EPISD Middle School Science Standards Based Curriculum 2015-2016
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Exhaustive
• Includes ALL possible variation combinations• It has already been broken down to its
smallest group
• What happens when a new species is discovered or bred?
EPISD Middle School Science Standards Based Curriculum 2015-2016
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Example of how to build your own Dichotomous key using office supplies
Uses electricity Does not use electricity
EPISD Middle School Science Standards Based Curriculum 2015-2016
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Dichotomous Key*ALWAYS start at question 1
1. a. uses electricity………...................................go to 2 b. does not use electricity………………………..….go to 32. a. has letter, symbols, and number keys……..keyboard b. has number and symbol keys ………………….calculator3. a. long, slender objects………………………………..go to 4 b. not long, slender objects………………………….go to ?4. a. made from plastic…………………………………….go to? b. made from something other then plastic….go to?
EPISD Middle School Science Standards Based Curriculum 2015-2016
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EPISD Middle School Science Standards Based Curriculum 2015-2016
Example of a Dichotomous key for insects
Image taken from http://www.rivercenter.uga.edu/education/watersheds2006/gps.htm
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Is it an Ant or a Grasshopper? 1. a. has six legs……………………………….….go to 2
b. does not have six legs…………………..go to 4 2. a. has an antennae…………………………..go to 3
b. does not have an antennae…………..go to 53. a. large hind legs for hopping…….grasshopper
b. no large hind legs for hopping………….Ant
EPISD Middle School Science Standards Based Curriculum 2015-2016
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Common Names vs. Scientific Namesmountain lion Felis concolor
gray wolf Canis lupus
humans Homo sapiens
saguaro Cactus Carnegiea gigantea
dog Canis familiaris
EPISD Middle School Science Standards Based Curriculum 2015-2016