When a ball is taken from the equator to the pole of the earth:

When a body is taken from the equator to the poles, its weight increases because the acceleration due to gravity increases.

The earth is not a perfect sphere. It is in an oval shape similar to the ellipse that’s why the gravity is not the same in each and every part of the earth. It is maximum at the place which is nearer to the center. So, the earth is kind of an ellipse and the equator is further away from the center of mass of the earth than at the poles. So, as we go from the equator to poles, the value of g increases.