Post on 03-Oct-2021
transcript
Dichotomous key
standards
GSE S7L1: Obtain, evaluate, and
communicate information to investigate the
diversity of living organisms and how they can
be compared scientifically.
GSE 7L1a:Develop and defend a model that
categorizes organisms based on common
characteristics.
Learning Target:
I can use a dichotomous key to identify an organism
Review:Taxonomy is the branch of
biology concerned with classifying and naming of organisms
Biologists who study this are called taxonomists
A cell is the basic unit of all living things
Organisms is any living thing.
Carolus Linnaeus developed a classification system based on similarities between organisms (plants/animals)
Levels of classificationKingdom: it is the first and largest category
in classification.
Species: it is the last and smallest category.
Kingdom (KING) Phylum (PHILIP)Class (CAME)Order (OVER)Family (FOR)Genus (GRAPE)Species (SODA)
SIX KINGDOMS
ArcheabacteriaEubacteriaProtistaFungiPlantaeAnimalia
Binomial nomenclature is a system/method used to name organisms. It consists of two italicized names. The first capitalized(genus) and the second lowercase (species).
Common Name: Cat
Scientific Name: Felis catus
Dichotomous Key
Is a tool used to identify organisms.
Tool to find organisms scientific name
At every step it has two questions. .
These questions will be answered .
as yes or no.
How dichotomous
key works?
Here are some unknown plants/
organisms
choose only one
organism at a time
Remember one at a time
Read [question]steps 1a and 1b1a] the plant has yellow flowers
1b] the plant has pink flowers
Decide which statement is true
1b is true
1a] plant has yellow flowers
….go to question number 2
1b] plant has pink flowers
…..go to question number5
so go to question number 5
At question number five you again have two choices
5a] plant leaver are wide
…………..go to question 6
5b] plant leaves are long /thin
…………. Day Lilly
so step 5 gave you the name DAYLIILY for the plant
Now you can start working on the next
plant.
Remember one organism at a time
Always start at question number 1