Question

Which characteristic is not unique (i.e., not a synapomorphy) to the angiosperms?

A. The production of triploid endosperm
B. The production of fruit
C. Xylem that contains mostly vessel elements and fibers
D. A reduced gametophyte generation
E. The production of flowers

Answer 1

The non-unique characteristic to angiosperms is 'C. Xylem that contains mostly vessel elements and fibers', as this is also found in the Gnetophyta, suggesting it's not exclusive to angiosperms.

Step-by-step explanation:

The characteristic that is not unique to the angiosperms is C. Xylem that contains mostly vessel elements and fibers. While xylem with vessels is indeed a characteristic of angiosperms, it is also found in another group of plants called Gnetophyta. This similarity suggests that vessel elements might have arisen independently in both groups.

Therefore, it cannot be considered a synapomorphy (a derived trait that is unique to a particular species or group) of angiosperms. In contrast, the production of triploid endosperm, the production of fruit, a reduced gametophyte generation, and the production of flowers are considered synapomorphies because they are unique evolutionary traits that define the angiosperms.