Question 4

The author mentions 'maize (Zea mays)' primarily to cite a species that differs from its wild progenitor in the size of some of its plant structures.

The mention of maize serves to illustrate how this domesticated crop has evolved from its wild ancestor, showcasing significant changes in the size of various plant structures, which is a key point in understanding the effects of domestication.

A) acknowledge that domesticated crops with certain features likely originated in similar ecosystems

While this option touches on the origin of domesticated crops, it does not specifically address the author's focus on maize's differences from its wild progenitor. The emphasis is not on ecosystems but rather on structural changes in maize itself.

B) emphasize that domestication of wild plants has resulted in a wide range of now-common food crops

This statement is somewhat relevant but broadens the discussion beyond maize specifically. The author’s intent is not merely to highlight the variety of food crops but to focus on maize's distinct structural modifications resulting from domestication.

C) cite a species that differs from its wild progenitor in the size of some of its plant structures

This option accurately captures the author’s primary purpose in mentioning maize. It highlights the specific differences in size between maize and its wild ancestor, which is crucial for understanding the implications of plant domestication.

D) provide evidence that certain traits shared by many domesticated plants are advantageous

This choice suggests a generalization about traits in domesticated plants rather than focusing specifically on maize. While traits may be advantageous, the author’s mention of maize centers more on its unique structural differences from its wild form.

Conclusion

The correct answer, C, is definitive because it directly addresses the author’s specific mention of maize in relation to its differences from its wild progenitor, thus illustrating the concept of domestication. Other options fail to focus on this particular aspect and either generalize the discussion or misinterpret the author’s intent.