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Topic: Dichotomous key

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	dichotomous key - Hutchinson encyclopedia article about dichotomous key (Site not responding. Last check: 2007-10-20)
		At each step, features of the organism are used to identify which one of two routes through the rest of the key is appropriate to the organism being identified.
		Dichotomous keys assume a good knowledge of the subject under investigation.
		Here is the route through a key that was used to identify field maple and sycamore trees: (1) If it is a tree then go to (2).
	encyclopedia.farlex.com /dichotomous+key (248 words)

	Dichotomous Keys
		: A dichotomous key is a tool that allows the user to determine the identity of items in the natural world, such as trees, wildflowers, mammals, reptiles, rocks, and fish.
		Keys consist of a series of choices that lead the user to the correct name of a given item.
		Use characteristics that are generally available to the user of the key rather than seasonal characteristics or those seen only in the field.
	nerds.unl.edu /Pages/preser/sec/skills/dkeys.html (528 words)

	Dichotomous Key - Wikibooks
		Identification of plants and animals in biology is frequently aided by using a dichotomous key, a (usually written) device constructed from a series of highly organized statements arranged into couplets.
		A very common error in using a dichotomous key is the assumption that the correct identification is even included in that key.
		For this reason, comparing the specimen with a more detailed description is vitally important—a dichotomous key alone cannot be used to identify specimens, unless the specimens are known in advance to be included within the key.
	en.wikibooks.org /wiki/en:Dichotomous_Key (296 words)

	Dichotomous Key (Site not responding. Last check: 2007-10-20)
		The dichotomous key that is developed should be constructed so that others in the class can read them and identify the common organism that is being described.
		Dichotomous keys should be completed using a word processing program and will be included in the presentation.
		The fifth day should be used by students to complete the dichotomous key using a word processing program and then possible start on the formatting of their presentation.
	www.fhsu.edu /irc/spproj/class/3/uop/dichotomous.html (1295 words)

	Dichotomous Plant Key (Site not responding. Last check: 2007-10-20)
		A dichotomous key is an important tool used by biologists to identify plants.
		The user of a dichotomous key must answer a series of questions about the plant he/she is trying to identify.
		This activity teaches you how to use a dichotomous plant key and learn some of the terms necessary to identify plants.
	www.nps.gov /goga/parklabs/library/plantkey.htm (96 words)

	Lucidcentral: Frequently Asked Questions
		Keys can be built to identify any group of things: the pieces of apparatus in a laboratory, the parts of a car, the species of termites in Africa, the types of stars in our galaxy.
		Keys are useful in any biological field where large numbers of taxa are difficult to distinguish just by using the naked eye and memory.
		Despite their wide use, dichotomous keys suffer from one very bad problem – you have no choice about the order in which characters are presented.
	www.lucidcentral.com /support/faq_general.htm (873 words)

	Dichotomous Keys
		When constructing a dichotomous key, the first step is to look at the group of objects or organisms and separate them into two groups based on a single distinguishing characteristic. Then continue to separate each of the groups until each object has its own separate set of characteristics.
		Working individually or with a partner your will create a dichotomous key based on the characteristics of various organisms. Your key will be evaluated by other groups of students as they use the key to try and identify each of the ten organisms.
		When you receive a key that has been created by another group use the key along with the group of preserved organisms or the list of organisms to try and identify each of the organisms. Fill in the names and/or identifying numbers for each of the organisms in the blanks provided.
	www.saskschools.ca /curr_content/biology20/unit3/unit3_mod1_les2.htm (566 words)

	Dichotomous Key
		The identification of biological organisms can be greatly simplified using tools such as dichotomous keys.
		A dichotomous key is an organized set of couplets of mutually exclusive characteristics of biological organisms.
		By following the key and making the correct choices, you should be able to identify your specimen to the indicated taxonomic level.
	sps.k12.ar.us /massengale/dichotomous_key.htm (106 words)

	ABLE: How to Construct and Use a Dichotomous Key
		Keys that are developed for state or regional floras often require that plants be collected for laboratory identification, where dissecting scopes are available to magnify extremely small parts not discernible with a field lens.
		The keys are useful for plants blooming from the middle of May to early July, and found on prairies in southwest Missouri and southeast Kansas.
		Following the keys, scientific names are given for the common names, followed by a glossary of terms used in the keys, and several illustrations.
	www.zoo.utoronto.ca /able/volumes/vol-12/7-timme/7-timme.htm (1245 words)

	Interactive Dichotomous Keys Search Found at FreeResumeExamples.net (Site not responding. Last check: 2007-10-20)
		Dichotomous keys are designed to assist people with the identification of all types of living things from plants to microbes.
		For dichotomous keys, the features considered useful and the sequence in which features are used are...
		The first computer programs for producing dichotomous keys were produced in the early 1970's by L.E. generate printed as well as interactive synoptic keys.
	www.freeresumeexamples.net /1t/technology/interactive%20dichotomous%20keys.html (307 words)

	page2 (Site not responding. Last check: 2007-10-20)
		This particular activity is a dichotomous key activity.
		A dichotomous key is a tool that scientists can use to help identify a particular specimen.
		The dichotomous key allows for the scientist to ask a series of questions with yes or no answers.
	www.lnhs.org /hayhurst/ips/dichot/page2.htm (235 words)

	Gordon's Key to Insect Orders
		People used to be faddy about the sort of key they liked, but these days the arrangement that has the greatest acceptability for simplicity and directness is the dichotomous key, so-called because at each step it asks you to choose between two alternatives.
		The best keys are often our own because when we read a couplet in a key we ourselves wrote, we have the advantage of a great many mental impressions that are not mentioned in the couplet, and which are not available, of course, to anyone else.
		This kind of key is often significantly called a 'Table', and is said to show the grouping of the insects better, while the numbers in brackets, referring to the other half of each couplet, make it easier to trace a way through the key, both forwards and backwards.
	www.earthlife.net /insects/orders-key.html (2991 words)

	Finders Series of Pocket Field Guides to Native Plants & Animals of U.S. and Canada
		Dichotomous key identifies wildflowers that grow within the range of the Redwood tree, Sequoia sempervirens, which grows in the coastal fog belt along the Pacific Coast from central California to southwest Oregon.
		Dichotomous key to spring wildflowers of US and Canada east of the Rockies and north of the Smokies.
		Key identifies native and naturalized herbs (non-woody plants) and ferns by their dry structures that remain in late fall and winter, such as pods, seed capsules, burrs, and dried flowers.
	home.att.net /%7Enaturebooks/finders.html (2591 words)

	[Regents Prep Living Environment] Laboratory: Dichotomous Keys
		A dichotomous key is a sequence of steps that allows the identification of a living thing.
		The key will consist of a series of choices that lead the user to the correct name of a given item.
		The term dichotomous means that there will always be two choices in each step of the key until the organism is correctly identified.
	regentsprep.org /Regents/biology/units/laboratory/dichotomous.cfm (354 words)

	Dichotomous Key (Site not responding. Last check: 2007-10-20)
		This activity introduces the use of dichotomous keys to children as a simple means of beginning scientific observations in nature.
		Now that everyone is familiar with dichotomous keys and the two-step process used to figure out what the organism is as well as a few botanical terms, hand out the weed keys.
		Students should work with a partner to figure out the types of weeds in the area using their dichotomous keys (these should be pre-determined and flagged, as some species are too difficult for kids/adults to figure out).
	www.weedcenter.org /education/lessons/dichotomouskey.html (389 words)

	Dichotomous Keys (Site not responding. Last check: 2007-10-20)
		Exercise 1: Given a container of beans, use one of the dichotomous keys above to identify the beans.
		When constructing a dichotomous key, you must be aware of the characteristics of the objects that you are separating.
		Dichotomous keys that you construct will be easier to use if you follow some general rules of thumb.
	www.park.edu /bhoffman/courses/bi225/labs/Dichotomous%20Keys%202.htm (1165 words)

	Web World Wonders (Site not responding. Last check: 2007-10-20)
		In this situation the term "dichotomous" means to divide into two groups that are not alike and most dichotomous keys work by using the individuals characteristics to place the organism into smaller and smaller groups until it can be identified to the species.
		Dichotomous keys usually include only certain groups of organisms, like trees or butterflies.
		Some keys are intended to cover only the most common species, while others are very comprehensive and require extensive knowledge of biology or botany.
	webworldwonders.firn.edu /cameras/keys/sa/tree.html (367 words)

	The Sky and the Dichotomous Key (Site not responding. Last check: 2007-10-20)
		They will go through the dichotomous key on the overhead when they do this, explaining how the route they took to arrive at the answer.
		If the students are at the 3rd grade level or higher, the dichotomous key can be use as a whole.
		If you have 6th grade students, you may can have them make their own dichotomous key so that someone else can use it to identify cloud type.
	asd-www.larc.nasa.gov /SCOOL/lesson_plans/The_sky_and_the_dich_key.html (552 words)

	Dichotomous Key
		Please note that this key is not comprehensive for Eastern Massachusettes, the Northeastern United States, or any other geographic region.
		The species included in the key are only those species covered by this field guide.
		This key is provided solely as an aid to identifying common conifers and should not be considered authoritative.
	www.bio.brandeis.edu /fieldbio/pkenlan/HTML/key_first.html (128 words)

	CONSTRUCTING A DICHOTOMOUS KEY
		Discuss the meaning of the term dichotomous explaining that the word means "two forks".
		Tell the students that dichotomous keys usually appear in a more compact form and that the diagram can be easily converted by adding numbers to each characteristic used.
		Ask a student to follow the key until the shoe is identified.
	www.iit.edu /%7Esmile/bi8611.html (443 words)

	Plant Restoration Project
		(30 minutes) Before students create a dichotomous key, they should be given a sample key, and everyone in the class should key out the same plant.
		Each group should be given one plant cutting and using a dichotomous key and plant terminology handout find out the species of the cutting.
		Using a dichotomous key and your plant terminology handout, find out the species of the cutting.
	nrs.ucop.edu /host/curricula/liz.html (1513 words)

	How to Use a Dichotomous Key (Site not responding. Last check: 2007-10-20)
		In a printed dichotomous key you will find at the end of each description either a name or a number, indicating the next couplet to examine.
		In the computerized dichotomous key also provided here, you simply click on the graphic to move to the next couplet or the species or group identified.
		As there are thousands of thrips species, be aware that using this key on a species outside the key's range will result in erroneous identification.
	www.gladescropcare.com /htdky.html (357 words)

	Key Directions
		This key consists of pairs of opposite choices or descriptive statements.
		To use this key, start at the first page and read the two statements.
		Note: drawings in the key are not to scale.
	www.people.virginia.edu /~sos-iwla/Stream-Study/Key/MacroKeyIntro.HTML (248 words)

	Sorting Through Spiders Lesson
		Student observation is the key to assessment as this is a group activity.
		Dichotomous keys are tools used by scientists and naturalists to identify specific names of natural objects, such as trees, ferns, wildflowers or insects.
		"Dichotomous" means "divided into two parts", so there are always two choices in a step to identification, usually in the form of a positive and a negative.
	score.kings.k12.ca.us /lessons/spiders.html (1644 words)

	How to Identify Birds Activity (Site not responding. Last check: 2007-10-20)
		Use a dichotomous key to determine the identification of a bird by its common name using characters such as size, shape, and color.
		A dichotomous key is often used to determine the identification of unknown animals.
		This type of key uses physical characteristics to map out the identity of the specimen.
	sciconn.mcb.arizona.edu /birds/birds_identify.html (393 words)

	What In The World Is A Dichotomous Key
		A dichotomous key is a listing of characteristics, such as structure and behavior, organized in such a way that an organism can be identified or classified.
		A dichotomous key is similar to a scavenger hunt.
		The student determined that based on the key the object was Orbis crudus.
	www.amaisd.org /nheights/dichotomous_key.htm (457 words)

	The Virtual Museum.
		A dichotomy is a split into two parts, hence a dichotomous key is one in which each step is split into two choices.
		The key is in the form of a series of couplets.
		On the next page there is a partial key to the skulls of mammals which should help you to understand how a dichotomous key works.
	www.abdn.ac.uk /~nhi708/laboratory/whatxt0.html (114 words)

	Lesson Plan
		There is a good dichotomous key in the front of this little book, which can be used as an example.
		After the lesson on the temperate deciduous forest, the students will collect ten different species of leaves and design a dichotomous key for their collection.
		The student will then design a key for their collection using the characteristics of the leaves.
	www.scsc.k12.ar.us /1999bst/Members/ReynoldsJ/lesson_plan.htm (235 words)

	Dichotomous Key Directions (Site not responding. Last check: 2007-10-20)
		A dichotomous key is a tool that allows the user to determine the identity of items in the natural world, such as trees, wildflowers, mammals, reptiles, rocks, and fish.
		From the genus description page you will also be able to connect to a species page to view pictures of the native tree species contained in that genus.
		If you are trying to determine the identity of a "mystery tree", work through the key until you reach the tree species that matches the given characteristics.
	www.oregonstate.edu /trees/dk/index.html (276 words)

	[No title] (Site not responding. Last check: 2007-10-20)
		PURPOSE: This is the clearest and easiest road to understanding construction of a dichotomous Key that I have found.
		Fill in 2A and 2B on the dichotomous key/ 2A not round twist (Shirley's) 2B not round not twist (Michael's) As soon as you've gone as far as necessary to identify an individual donut then name whose it is. Continue until all donuts have their own individual category.
		Learners must name all the characteristics to "key out" their donut before they can have it to eat.
	www.col-ed.org /cur/sci/sci168.txt (498 words)

	Pizzo & Associates: Links and Resources
		Dichotomous key for the flowering plants and ferns of the Lake Michigan coast of Indiana and the Calumet District.
		Includes a dichotomous key, sketches and descriptions of plants, and a map of Illinois counties to show plant range.
		Dichotomous key with illustrations for submersed, floating, and a few shallow water and muddy shore plants.
	www.pizzo1.com /links.php (2235 words)

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