Regarding leaf aroma, which statement is true?

• A. Monocots have aroma in the topside and underside of leaf; dicots have aroma only on one side
• B. Monocots have aroma only on one side; dicots have aroma on both sides
• C. Both monocots and dicots have aroma on both sides
• D. Neither monocots nor dicots have any aroma

Answer: (A)

Leaf aroma comes from volatile compounds produced by specialized tissues in the leaf. In monocots, the tissues that generate and release these volatiles are often present on both the upper and lower leaf surfaces, so aroma can be detected from either side. In many dicots, those aroma-producing glands or secretory structures are more concentrated on one surface, so the aroma is typically noticeable on that single side. This pattern matches the statement, making it the best choice. If aroma were absent or consistently restricted to the other group, or if both groups showed aroma on both sides, those options wouldn’t align with how aroma-producing tissues are distributed in leaf anatomy.