Plant from which stem is taken during grafting is called ________.

Explanation

**Step-by-Step Solution:**

1. **Understanding Grafting**: Grafting is a horticultural technique where a part of one plant (the scion) is inserted into another plant (the rootstock) so that they grow together.

2. **Identifying the Parts**: In grafting, the part of the plant that is taken to be grafted onto another plant is called the "scion." The plant from which the scion is taken is referred to as the "scion plant."

3. **Terminology**: The term "scion" specifically refers to the stem or branch that is grafted onto the rootstock.

...