Final answer:
The whip and tongue graft is the type used for woody plants when scion and stock are of equal size, combining a sloping cut with an interlocking 'tongue' for a strong union.
Step-by-step explanation:
When grafting woody plants and the scion and stock are of equal size, the whip and tongue graft is often used. This method involves creating a sloping cut in both the scion and the stock, with a second cut creating a 'tongue.' The two sections are then fitted together so that the 'tongues' interlock, and this provides a strong union as the plant heals. This technique is beneficial as it allows a relatively large surface area for the cambium layers (growth tissue) of the scion and stock to come into contact, which improves the chances of a successful graft.