Question

Stocks and scion are used in
a. Cutting
b. Grafting
c. Layering
d. Micropropagation

Answer 1

Hint: For the commercial growth of a plant, two different plant parts are joined to grow their vascular system together. These two different plant parts are called scion and stock or rootstock. The upper portion of the added plant is called scion and the lower portion is named as stocks.

Complete answer:
> Option A: Cutting: To propagate a new plant independently, a small part of a plant is used to place under suitable conditions. This piece of plant is called cutting and the process is known as striking. Cutting is a sexual or vegetative propagation. In this process, either stem or root is used as the cutting to grow a new plant. From stem cutting, new roots are grown under preferable conditions. From root cutting, stems are propagated. In some plants, leaves are also used to generate a new plant. Leaf-cutting generates both new stems and roots for survival.

> Option B: Grafting: The process by which two different plant tissues are joined to grow uniformly is called grafting. Scion can be a young shoot or bud and stock involves a healthy root system and a portion of the stem. In grafting, the scion is placed over the rootstocks to grow a new plant with beneficial characteristics of the scion.

> Option C: Layering: The process by which root is developed on a stem without detaching it from the older plant is called layering. The newly formed rooted stem is known as the layer. In this process, a small wound is created at the specific area of the selected stem. Thena rooting medium like soil is provided to the ruptured area and other necessary factors are taken care of to grow the new roots.

> Option D: Micropropagation: Artificial propagation of plants through tissue culture is called micropropagation. There are five types of micropropagation methods found, named Meristem culture, Callus culture, Suspension culture, Embryo culture, and Protoplast culture.

Hence, the correct answer is option (B).

Note: Grafting is also known as graduate. Grafting involves man advantages which are given below:
Implementation of scion results in the growth of the beneficial characterized plants with high disease resistance power.
Grafting consumes less time to produce desired fruits and flowers from a juvenile plant.
Grafting can produce a dwarf plant, which is more convenient for plantation.