Aplant with high is healthy and rigid.
cell walls
turgor
stroma
pith

A plant with high turgor is healthy and rigid.

The water pressure inside the plant cell is called as turgor pressure, which is maintained by the process of osmosis in which the water moves across a permeable membrane from a place of higher concentration to lower concentration. The turgor pressure makes the plant cell in the swollen state and it exerts the pressure against the neighboring cells, these neighboring cells also maintains the same turgidity. This provides the rigidity to the plant structure, hence prevents wilting of the plant.

b. heterotroph

explanation:

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.