Question

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

albizia julibrissin
albizia julibrissin

cornus florida
cornus florida

pinus taeda
pinus taeda

juglans nigra
juglans nigra

Answer 1

The plant has many broad leaves with rough edges. Based on the dichotomous key:

1b indicates the leaves are broad, which leads us to step 2.
Going to 2b, we see that it has many leaves. We then go to step 4.
In step 4, since the leaflet edges are rough, it corresponds to Juglans nigra.

Therefore, the correct answer is **Juglans nigra**.