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Answer.

Dichotomous key is a biological device (tool) which enables one to identify an organism by progressively opting between two alternative observable. The major features of the characteristics to be identified includes;-

1. Look at the features of similarities and differences between the organisms

2. We can then be able to identify the organisms by distinguishing one from another

3. The key uses a method of elimination by following statements that are correct only for the organism. Examplele of dichotomous key:

1 a) Leaf broad……. Go to 2
b) Leaf narrow……. Araicaria

2 a) Leaf parallel vein……. Cynodon
b) Leaf net veined……. Go to 3

3 a) Leaf with one lobe (simple Leaf)……. Go to 4
b) Leaf with many lobes (compound Leaf)……. Grevellea

4 a) Leaf Fleshy……. Kalanchoa
b) Leaf not fleshy……. Go to 5

5 a) Leaf petiole modified to form sheath……. Go to 6
b) Leaf petiole not modified to form sheath….Tradescantia

6 a) Leaf purple……. Tradescantia
b) Leaf green……. commelina

Steps 1a, 2b, 3a, 4b, l. Identify- Brassica

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