ACT Science

SAT Question Of The Day

The SAT question of the day is an Identifying Sentence Errors Question that has already been addressed on this blog: click here to see an explanation.

ACT Science Question Of The Day

ACT science questions always follow a passage that often contains multiple figures.  Today's question, however, focuses on a single figure, so there is only one figure reproduced below.

During the early stages of succession, the principal community (living unit) that dominates is the pioneer community. Pioneer plants are depicted in Figure 2.


According to Figure 2, pioneer plant(s) showing a progressive increase in summed diameter of stems per unit area over the course of several years of succession is (are):

Take a look at Figure 2, starting with the key.  The width of the bars shows the summed diameter of the stems.  You must decide which of the three plants gets progressively wider as the years pass.  Horseweed does not; its growth does not show a particular relationship to the years, and both of the bars in its row are the same width.  Aster also does not show a progressive increase; it starts out narrow, gets wider, and then gets narrow again.  Look at broomsedge.  In year 1 it is narrow, in year 2 it increases, and in year 3 it becomes very wide.  Broomsedge is the only plant that shows a progressive increase in summed diameter.  Look down at your answer choices.

A. horseweed only.
B. broomsedge only.
C. aster and broomsedge only.
D. horseweed, aster, and broomsedge.

The correct answer is (B).

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