Which of the following is NOT classified as a dry fruit?

A drupe is classified as a fleshy fruit rather than a dry fruit. Drupes typically have a soft outer layer, which is the exocarp, and a hard inner layer, known as the endocarp, that surrounds the seed. This structure distinguishes drupes from dry fruits, which do not have this fleshy component.

In contrast, capsules, achenes, and legumes are all examples of dry fruits. Capsules are formed from multiple carpels and can split open to release seeds. Achenes are single-seeded fruits that are not fused to the pericarp, while legumes develop from a single carpel and usually split open along two sides when mature to release their seeds. These structural differences are key in understanding the classification of fruits based on their moisture content at maturity.