Question 2
A small plant arises sideways from the base of a stem that is sunk in the soil. What is it?
The right answer is the one marked above.
A sucker — a small plant growing sideways from the base region of a buried stem, coming up beside the parent.
A runner is the easy one to confuse it with, but a runner lies on top of the soil and travels across it. A bulbil is a modified bud that detaches, and a rhizome is a whole underground stem rather than a plantlet.