Stolon is an example of
The correct option is B Sub-aerial stem modification
Subaerial Modifications remain sub- aerial which grows horizontally on the surface of the soil for the purpose of reproduction.
Stolon is an example of a sub-aerial stem modification. It is a weak lateral branch that arises from the base of the main stem. After growing aerially for some time it bends downwards to touch the ground, where its terminal bud gives rise to a new shoot and adventitious roots. The common stolon-bearing plants are Jasmine, Colocasia, etc.
A rhizome is a modified stem that grows horizontally underground; it has nodes and internodes.
The subaerial stem is a stem that remains partly in the air and partly underground. It is also known as 'Creeper'.
Many vegetables, such as carrots and beets, are modified roots that store food and water. So these are examples of underground root modification.