Dichotomous Keys in Biology
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Lesson:
Using keys
Grade: 6 CS
Types of dichotomous keys
Spider/ branched key
Numbered key
A key uses a series of questions to distinguish each species from the rest .
Victor uses
three questions
to distinguish these four cats .His first question separates
them into two groups. His next questions separates the members of each group .
Put the cats’ names into the correct boxes in the table below
Leopard and cheetah
Lion and caracal
Leopard
Cheetah
Lion
caracal
Leech
Water
spider
Fresh water
shrimp
Pond skater
Diving beetle
yes
no
yes
no
Earthworm
Use the key to identify the name of each organism.
Ragworm
Snail
Slug
Earthworm
Stonefly larva
damselfly larva
Dragonfly
larva
D
Arachnid
Mollusk
Crustacean
D
Annelid
Musca
Anopheles
Periplaneta
Ornithodorus
Pulex
Pediculus
A simple dichotomous
key used to identify
different groups of
mammals is provided. An
organism that gives birth
to live young but does
not possess a pouch and
has no wings is
discovered. Using this
dichotomous key,
determine which group it
is most likely to belong
to.
A simple dichotomous
key used to identify
different groups of
mammals is provided. An
organism that gives birth
to live young but does
not possess a pouch and
has no wings is
discovered. Using this
dichotomous key,
determine which group it
is most likely to belong
to.
Delve into the world of dichotomous keys with lessons on their types and practical application. Learn how to use these keys to identify various organisms and classify them based on specific characteristics. From distinguishing between different cat species to identifying aquatic organisms, this exploration provides a hands-on experience in biological classification methods.
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Presentation Transcript
Lesson: Using keys Grade: 6 CS
Types of dichotomous keys Spider/ branched key Numbered key A key uses a series of questions to distinguish each species from the rest .
Victor uses three questions to distinguish these four cats .His first question separates them into two groups. His next questions separates the members of each group . Put the cats names into the correct boxes in the table below Leopard and cheetah Lion and caracal Lion caracal Leopard Cheetah
Diving beetle Leech Pond skater Fresh water shrimp Water spider
Use the key to identify the name of each organism. no no yes yes Earthworm
Ragworm Snail Slug Earthworm
Dragonfly larva Stonefly larva damselfly larva
D Arachnid Mollusk Crustacean Annelid
Anopheles Pediculus Pulex Ornithodorus Musca Periplaneta
A simple dichotomous key used to identify different groups of mammals is provided. An organism that gives birth to live young but does not possess a pouch and has no wings is discovered. Using this dichotomous key, determine which group it is most likely to belong to.
A simple dichotomous key used to identify different groups of mammals is provided. An organism that gives birth to live young but does not possess a pouch and has no wings is discovered. Using this dichotomous key, determine which group it is most likely to belong to.
