|Question 9Verbal

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Auxins are a class of hormones that influence plant growth, including leaf orientation (the tendency of leaves to be larger on one side of their long central axis than the other). University of California, Berkeley biologist Ciera Martinez and colleagues noted that in certain plants in which leaves grow in pairs, auxins will typically be concentrated in opposite sides of each leaf in the pair (e.g., on the left side of one leaf in the pair and the right side of the other). Accordingly, they hypothesized that paired leaves should tend to show opposite side orientation, and they tested their hypothesis by examining paired leaves from several species of grapevines.
Which choice best describes data from the graph that support Martinez and colleagues' hypothesis?
The number of leaf pairs showing opposite side orientation is fairly high in the July grape, but not as high as it is in the graybark grape.
A
Although the number of leaf pairs showing same-side orientation is fairly high in the July grape, it is much lower in both the frost grape and graybark grape.
B
Although the exact ratio varies by species, the graybark grape, frost grape, and July grape all show more leaf pairs with opposite side orientations than with same side orientations.
C
In the graybark grape, frost grape, and July grape, all the leaf pairs show opposite-side orientation.
D