### Solution:

Concept- An inkpot has both plane and curved surfaces.The most fundamental of curvilinear geometric shapes, a cylinder has historically been a three-dimensional solid. It is the idealized representation of a real, sturdy tin can with top and bottom covers. However, the advanced mathematical perspective has changed to the infinite curved surface, and a cylinder is now described in several modern fields of geometry and topology using this perspective. This conventional view is still used in elementary courses of geometry.

Using an inkpot as an example

From this image, we can clearly see the front. Its cylindrical shape is visible. The part of the front that is visible to us is shaped like the convex surface of a cylinder.

In order to gain additional understanding, let's look at the bottom surface of this.

Its bottom surface will definitely match whatever is described below:

We can clearly observe that it is a planar surface that resembles a circle or an ellipse.

A result is that an inkpot has both plane and curved surfaces.

Hence, "plane and curved" is the correct response to this question.