Is a horizontal stem at or just beneath the surface of the ground which can give rise to roots or stems.
a. mitospore
b. multiple fission
c. stolon
d. rhizome

The correct answer is the (d.) rhizome. A rhizome is a horizontal stem at or just beneath the surface of the ground in which can give side to the roots and stems. It puts the lateral shoots of roots at intervals. 

By water evaporation from the leaves is created a negative pressure at the top of the tree that promotes the ascension  of the water through channels that are called xylem. there are also two molecule forces that are involved: the intra-water molecules cohesion (water molecules stick to each other) and the adhesion when the water molecules stick to the channels they are running in. this is what enables water to go from the roots to the top of a tall tree.