A dichotomouys key is used to identify a plant.
1a. Leaves are spiny ......................Pinus taeda
1b. Leaves are broad..................... Go to 2
2a. Single leaf..........................Go to 3
2b. Many leaves....................... Go to 4
3a. Leaf edge is smooth..............Cornus florida
3b. Lead edge is rough...............Ulmus americana
4a. Leaflet edges are smooth........Albizia julibrissin
4b. Leaflet edges are rough.........Juglans nigra
A plant has many broad leaves with rough edges. What type of plant is this?
(1 point)
Responses
juglans nigra
juglans nigra
albizia julibrissin
albizia julibrissin
cornus florida
cornus florida
pinus taeda
pinus taeda
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1 answer
The plant you described has many broad leaves with rough edges. Following the dichotomous key:
1b indicates the plant has broad leaves and leads us to step 2.
In step 2, since the plant has many leaves (not a single leaf), we go to step 4.
In step 4, since the leaflet edges are rough, we identify the plant as:
Juglans nigra.
