What nondigestible form of complex carbohydrate occurs naturally in plant foods such as leaves, stems, skins, seeds, and hulls?

Dietary fibre or Fibre.

Explanation:

Dietary fibre is a type of carbohydrate that cannot be digested by our bodies' enzymes. It is found in edible plant such as cereals, fruits, vegetables, nuts, lentils, grains etc.

Fibre is advantagoues to weight loss and efficient bowel movements.

Dietary fiber

Explanation:

Dietary fiber are a form of complex protein that can not be digested by the human digestive enzymes, they comprise of soluble fibers which easily be dissolved in water and insoluble fiber which does not dissolve in water. Fibers in general aids digestion in humans. Examples of these dietary fibers found in plants are lignins, pectins, inulin, cellulose etc.

Examples of foods that contain dietary fibers are nuts, grains, cereals, fruits and vegetables; they either be found in the leaves, stems, skins, seeds and hulls.