Dichotomous key..\Desktop\How to use a dichotomous key.mp4

definitionBiological tool used for identification of

organisms based on observable characteristics

A series of choices based on two alternative descriptions of the characteristics

GuidelinesOne characteristic at a timeProceed from general to specific

characteristic until the organism is identifiedAvoid overlapping and ambiguous statementsUse observable characteristics onlyAvoid negative statements unless otherwiseCreating a dichotomous key.mp4

Features used in leavesType of leaves

SimpleCompound

Type of venationParallelNetwork/ Reticulate

Type of marginSerratedEntire

• Leaf arrangement Alternate Opposite Whorled

Types of leaf margins & VenationLEAVESLEAVES II

PalmatePinnateBi-pinnateTrifoliatecompound leaves.docx

Types of compound leaves

Dichotomous key1a) Leaf simple…………………..go to 2 b)Leaf compound……………….go to 42a)Leaf with parallel veins………Tradescantia b)Leaf with network venation………go to 3 3a)Leaf margin entire……………Bougainvillea b)Leaf margin serrated………Hibiscus 4a)Leaf pinnate………………………Nandi

flame b)Leaf bi-pinnate…………………Jacaranda

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