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Dichotomous keys, charts consisting of rules and steps separated by a series of dots, are used in biology to identify and classify organisms. If an animal fits a particular rule, the reader goes on to the next step.

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Dichotomous Key Definition. A dichotomous key is a tool created by scientists to help scientists and laypeople identify objects and organisms. Typically, a dichotomous key for identifying a particular type of object consists of a specific series of questions. When one question is answered, the key directs the user as to what question to ask next. Editable dichotomous key template to create dichotomous key online. Edit this using our dichotomous key maker and easily determine the identity of natural world like animals, trees, etc.-You can edit this template on Creately's Visual Workspace to get started quickly. Adapt it to suit your needs by changing text and adding colors, icons,. A dichotomous key is a method for determining the identity of something (like the name of a butterfly, a plant, a lichen, or a rock) by going through a series of choices that leads the user to the correct name of the item. Dichotomous means 'divided in two parts'. At each step of the process of using the key, the user is given two choices; each alternative leads to another question until the item is identified. Key or a dichotomous key by consulting different sources and finding the characteristics of the above species. The best source that we have is the Bergey's Manual. Thus, we go to the index or table of contents of this manual, and finding the genera names, determine if they are cocci, rods or spirilla and also find their reaction to the Gram stain.

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Make a Dichotomous Key: Classroom Activity

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A dichotomous key is a series of questions which leads to the identification of an item.

A dichotomous key is a method for determining the identity of something (like the name of a butterfly, a plant, a lichen, or a rock) by going through a series of choices that leads the user to the correct name of the item. Dichotomous means 'divided in two parts'.

At each step of the process of using the key, the user is given two choices; each alternative leads to another question until the item is identified. (It's like playing 20 questions.)

For example, a question in a dichotomous key for trees might be something like, 'Are the leaves flat or needle-like?' If the answer was'needle-like,' then the next question might be something like, 'Are the needles in a bunch or are they spread along the branch?' Eventually, when enough questions have been answered, the identity of the tree is revealed.

Classroom Activity:

As a simple example, you can construct a dichotomous key to identify people (or another group of items) in a classroom, using questions based on gender, hair length/color, glasses (or not), clothing color, etc.

Question 1: Is the person male or female?
Question 2: Does the person wear glasses or not?
Question 3: Is the person wearing blue jeans or not?
etc.

The end of each branch of the key should be a person's name.

A dichotomous key will have enough questions to identify each member of the group. To test it, you can identify each person in the group by going through the key and seeing if the right name comes up.

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Dichotomous key

A dichotomous key is guide, sort of like a map of characteristics, to lead the user to the correct identification of the plant. The word dichotomous comes from two Greek words that mean divide in two parts. To make a dichotomous key you will choose physical characteristics that can be used to divide a collection into two parts. Possible physical characteristics to use include plant size, plant shape, leaf shape, stem type, color, and presence of seeds, fruits or flowers. You will continue to divide each group in two until all of the groups have only one member.

How to do it

Step 1: Begin by gathering your plants (or pictures of plants) to be identified. For example: a corn plant, hosta, oak tree and dandelion.

Step 2: Decide how to split your group in two parts. All nokia phone flashing software. Carefully observe your specimens to pick a characteristic which can be used to decide which plant goes into which group. Record the chosen characteristic and the groups formed. For example, this group of corn, hosta, oak tree and dandelion could be divided by leaf color:

A. The leaves are solid green. See #2.

B. The leaves have a white margin. Your plant is a hosta.

Step 3: After the collection has been divided into two groups, divide the first group (group A) into two more groups based on one characteristic. Record your characteristic and groups. When you form a group with only one plant, name it. The next division in this example is leaf edge:

A. The leaves have a straight edge. Your plant is corn.

B. The leaves have a curvy edge. See #3.

Step 4: Continue to identify characteristics and divide groups until all of the plants are named. Be sure to record each division made. When the first group is complete, repeat the steps until all of the plants in the second group (group B) have been named. Your completed key should look so

Make A Dichotomous Key Generator