Question

Stock and scion are used in
(a) Cutting
(b) Grafting
(c) Layering
(d) Micropropagation

Answer 1

Hint: Stock and scion are used in the procedure most widely used for the commercially grown plant during asexual propagation. Stock is the upper part of the plant which yields high-quality fruit, and scion is the lower base part of the plant with a good root system and better water transportation. Both are taken from different plants and used to be bound together to create a new plant variety with the appropriate quality.

Complete step by step answer:
Scion is the dissociated living part of the plant that is grafted onto the stalk by the grafting process. Grafting is a technique of horticulture in which the live detached portion of the plant is used to regenerate growth. One plant is chosen for its roots, and this is called the rootstock or stock. For its roots, leaves, flowers, or fruits, the other plant is chosen and is called the scion. The process of scion and stalk joining is known as inosculation. The scion and stock contain the required genes which will be duplicated by the stock and scion plant in future development.
The vascular cambium tissues of the stock and scion plants must be put in contact with each other for effective grafting to take place. Both tissues must be kept alive, normally for a period of a few weeks, before the graft has "taken." Effective grafting only requires a vascular connexion between the grafted tissues to take place. Grafting is still used because it is the most cost-effective method of growing a specific plant type commercially.

Additional information:
Wild, normal, vigorous, strong, disease-free, and one with a well-developed rooting system are the stock or rootstock. For example a wild mango. The Scion is a high quality, superior variety that has characters that are commercially and/or aesthetically appealing. For example, Alphonso mango.
So, the correct answer is, ‘Grafting’.

Note: Grafting is a horticultural technique in which tissues from one plant are inserted into those of another plant, so that the two sets of vascular tissues may merge. A scion is a piece of young stem or bud that is inserted into a rootstock. Scion is chosen for good fruit quality, flowers, disease resistance, etc. A rooted stem that is grafted into a scion or bud is called a stock. Stock is chosen for its adaptability, disease tolerance, etc.