Question

A dichotomous key is used to identify a plant below.
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. Leaf edge is rough.............................Ulmus americana
4a. Leaflet edges are smooth..................Albizia julibrissin
4b. Leaflet edges are rough....................Juglans nigra
A plant has a broad single leaf with smooth edges. What type of plant is this?
(1 point)
Ulmus americana
Pinus taeda
Juglans nigra
Cornus florida

Answer 1

Based on the description provided, the plant has a broad single leaf with smooth edges. Referring to the dichotomous key:

- The leaves are broad, so we go to step 2.
- The plant has a single leaf, so we go to step 3.
- The leaf edge is smooth, leading us to Cornus florida.

Therefore, the type of plant is **Cornus florida**.