Base your answers to questions 5 and 6 on the diagram below, which shows the sequence of plant
communities that have occupied land that was left barren 300 years ago, and on your knowledge of
biology
WANAM
Pine
Barren sol Crabgrass Ragweed, aster, Broomsedge
and broomsedge and
and pine
horsewood pine seedlings seedlings
Mature pine
and young
deciduous trees
Oak and hickory
forest with pine
Mature, stable
hardwood forest
(mainly oak
and hickory
Present time
300 years ago
5. Dominant plant species in the climax community include
A) pine trees B) hickory trees C) mosses D) lichens
6. Which plant species represent pioneer organisms?
A) broomsedge and pine seedlings
B) ragweed and aster
C) crabgrass and horseweed
D) oak and hickory trees
I