Given diagram shows the vertical section of strawberry. Identify the part labelled as '?'

Step-by-step solution

The fruit of strawberry is actually an aggregate fruit formed from a polycarpellary apocarpous gynoecium. It is not a berry. The fleshy part of the fruit is actually derived from the thalamus and the one depicted in the diagram is the thalamus. Each seed seen on the surface on the strawberry is actually one fruit with seed in it.