Scion is the term used in relation to?

Grafting

The correct answer is Option (1) - Grafting

A scion is a form of vegetative propagation. The system of artificially growing plant life is called vegetative propagation. Artificial vegetative propagation is normally used for propagation or replication of this flora which produces either only a few seeds or does not produce feasible seeds.

Layering, grafting, cuttings, and tissue tradition are some varieties of synthetic propagation.

Scion or grafting of a plant is a way of eliminating the twig or possible bud from the plant. In most cases, one plant is chosen for its roots and that is referred to as the stock or rootstock. The other plant is chosen for its stems, leaves, plant life, or fruits and is called the scion.