Auxin causes a plant to grow larger by:
| Stimulating the acidification of cell walls, causing them to loosen and stretch via turgor pressure, resulting in larger cells. |
| Causing an increase in the speed of cell divisions and maturation. |
| Stimulating the apical meristem to produce new cells. |
| Causing an asymmetric increase in the length of the stem or root. |
Answer
Auxins are a group of phytohormones that helps in cell
elongation by stimulating wall-loosening factors, such as elastins,
to loosen cell walls. The loosened cell walls are stretched by the
turgor pressure, which pushes the cell walls to elongate.
Thus, the first option, Stimulating the acidification of
cell walls, causing them to loosen and stretch via turgor pressure,
resulting in larger cells, is correct answer.