How does the stony endocarp of a drupe protect its seed?

In a drupe, the pericarp is organized into three distinct layers: the outer exocarp, the fleshy or fibrous mesocarp, and the inner endocarp. The endocarp, often referred to as the pit or putamen, is a hard, stony structure that serves as a protective casing for the seed contained within.123

By forming this rigid, bony barrier, the endocarp shields the delicate seed from physical damage and environmental stressors. This structural defense is a key characteristic of drupes—such as cherries, peaches, and olives—ensuring the seed remains intact as it develops and eventually reaches the soil.132