SAT Subject Biology Practice Question 103: Answer and Explanation

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Question: 103

13. Flowering plants are divided into two subgroups, monocots and dicots. These groups differ significantly in all of the following characteristics EXCEPT

A. seed structure
B. floral parts
C. leaf venation
D. stomata structure
E. vascular organization

Correct Answer: D


Stomata are pores in leaves formed by guard cells. They are organized the same way across the plant kingdom. In contrast, monocots possess seeds with only one cotyledon (embryonic leaf tissue) while dicot seeds possess two, making Choice A incorrect. Monocots possess flowers with parts in multiples of three, whereas dicot floral parts occur in multiples of four or five, making Choice B incorrect. Monocots typically have parallel-veined leaves while dicots have network-veined (or reticulate-veined) leaves, making Choice C incorrect. In both roots and stems, vascular tissues are arranged differently in monocots and dicots, making E incorrect.

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