CLASSIFICATION II

PRESENTER:MALUU LUKE.Email:lukemaluu@yahoo.com

DICHOTOMOUS KEY

• Construction of a simple dichotomous key and it`s use.

• A dichotomous is a set of instructions used to identify unknown organisms by using descriptions of observable features.

• We are going to construct a dichotomous key using some leaves provided.

PROCEDURE

• List down all the major characteristics of the 5 leaves provided based on

• 1)type of leaf.• 2)type of venation.• 3)type of tip.• 4)arrangement of leaflets.

MAJOR CHARACTERISTICS.

• Leaf A:-simple leaf.• :-network venation.• :pointed tip.• Leaf B:-simple leaf.• :-parallel venation.• :pointed tip.

CONT:

• Leaf C:-simple leaf.• :-network venation.• :-round tip.• Leaf D:-compound leaf(pinnate)• :-network venation.• :-leaflets with pointed tips.• Leaf E:-compound(digitate)• :-network venation.• :-leaflets with rounded tips.

DICHOTOMOUS TREE

• Sub divide the 5 given leaves into • a)simple and compound leaves.• b)parallel and network venation,

round and pointed tips on simple leaves only.• c)on compound leaves-pinnate and

diginate.• A,B,C,D,E

COMPOUND D,E

SIMPLE A,B,C

Parallel vein

Net vein

Pinnate D

Digitate E

Round tip C

Pointed tip A

THE DICHOTOMOUS KEY

• Using the information above, construct a dichotomous key.

CONSTRUCTED DICHOTOMOUS KEY

• 1.(a)simple leaves……go to 2• (b)compound leaves…….go to 4• 2.(a)parallel veined………B(maize leaf)• (b)net veined………go to 3• 3.(a)round tip……….C(guava leaf)• (b)pointed tip…….A(bourgainvillea)• 4.(a)pinnate leaf……..D(eucalyptus)• (b)digitate leaf……….E(bombax)

EXERCISEUse the 7 leaves given to construct a

dichotomous key

DICHOTOMOUS KEY

CONCLUTION• THANK YOU.