Question

The upper stem portion is ...............

• A. Stock
• B. Scion
• C. Tiller
• D. Twiner

Answer 1

Answer: (B)

Scion

The vegetative reproduction is a means of rapid propagation, as sex cells are not involved, the progeny is identical to parent plant and the process is a type of asexual reproduction. Vegetative reproduction can be natural or artificial (cutting, layering, grafting or use of stocks). Grafting is commonly used artificial method of vegetative propagation. In grafting cut stem end (scion) of one plant is artificially tied using wet clay to another obliquely cut stem (stalk) which is still attached to roots. The cambial activity in the stalk and scion later on establishes a vascular link between two plants. Arguably the process is possible because plants lack a well developed immune system which can reject foreign grafts.