Construction and Use of Dichotomous Keys
• Biological keys are sets of statements that act as clues leading to the identification of an organism.

Use the dichotomous key maker to arrive at a conclusion. The dichotomous key maker is available inside the Visme editor with the help of the free flowchart maker. Select one of the professionally designed templates, select a starter block or start from scratch. Personalize the shape styles, colors and fonts to match your vision. 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. On this site possible to create online dichotomous identification keys. Fallout 3 unique chinese assault rifle. A new key can be generated after registration on this site. After the account has been activated the user can contact the Administrator (Paul Beuk) with the request to create a new key. Mg crossover. D%26d 3.0 dmg. Typically, the first step of a dichotomous key looks something like this: 1a. Learning Intention: Students will understand how a dichotomous key is used to classify dichotomous key generator identify organisms in the living world. Taxonomists-scientists who classify things into groups-create and use dichotomous keys to help others identify.

• By following the keys we can be able to place an organism in its group.
• The most common key is the dichotomous key.
• This is a biological tool for identification of unknown organisms.
• The word dichotomous means branching into two.
• A single characteristic is considered at a time.
• Two contrasting statements are put forward to describe the characteristics in such a way as to separate the organisms.
• This continues until all the organisms have been identified.
Rules Used to Construct a Dichotomous Key
• Use morphological characteristics as far as possible e.g. type of leaf - simple or compound.
• Select a single characteristic at a time and identify it by number. 1. Type of leaf. .
• Use identical forms of words for two contrasting statements e.g.:
a) Flowers scented.
b) Flowers not scented.
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• Start with a major characteristic that divide the organisms into two large groups then proceed to lesser variations that would separate the organisms further into smaller groups.
• Use positive statements especially the first one.
Make

• Avoid generalizations e.g. short plants. Be specific in your description e.g.:
a) Plants above 1m tall.
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b) Plants below 1m tall.
Some Common Features Used for Identification
In Plants
Leaves
1. Type of leaf Leaf
Compound leaves.
• Simple leaf
• Trifoliate Make A Dichotomous Key Generator

• Pinnate
• Type ofleaf margin.
Type of venation.
• Type ofleaf arrangement on stem.
• The colour of leaf.
• The texture ofleaf; whether hairy or smooth.
• Shape of the leaf e.g. palmate.
Stem
• Type of stem - woody or herbaceous.
• Shape of stem - cylindrical or rectangular.
• Texture of stem smooth or spiny.
Infloresence
• Are flowers terminal or lateral
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• For each flower:
• Is the flower regular or irregular?
• Number of floral parts for each whorl.
• Are floral parts free or fused?
Roots
• Type of root system- Taproot or fibrous?

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• Function of the root.
In Animals
Features used to identify animals:
• Type of mouthparts.
• Type of skeleton.
• Presence or absence of antennae.
• Body segmentation.
• Body covering: scales, fur, hair or feathers.
• Number of body parts.
• Locomotory structures: legs, wings and fins.

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• Presence or absence of vertebral column.

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• Presence and type of eves.