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(C) Auxin promotes cell elongation by increasing the plasticity of the cell wall and by stimulating the active transport of solutes into the cell. Whe

Vedclass · Accepted Answer

Auxin lowers the water potential of cells

Vedclass · Answer

(C) Auxin promotes cell elongation by increasing the plasticity of the cell wall and by stimulating the active transport of solutes into the cell. When auxin is applied, it increases the concentration of solutes within the cell, which in turn lowers the water potential $(\Psi_w)$ of the cell. According to the principles of osmosis, water moves from a region of higher water potential to a region of lower water potential. Even in a hypertonic solution, if the cell's internal water potential is lowered sufficiently by the accumulation of solutes, the cell can still absorb water from the surrounding medium. Therefore, the correct explanation is that auxin lowers the water potential of the cells.

Levitt performed experiments. He observed that auxin-treated cells were able to absorb water even when kept in a hypertonic solution. Which explains this observation best?

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