The Value for Ψ in Root Tissue Was Found to Be

question 44

Multiple Choice

The value for Ψ in root tissue was found to be -0.15 MPa. If you take the root tissue and place it in a 0.1 M solution of sucrose (Ψ = -0.23 MPa) , the net water flow would ________.

• A) be from the tissue into the sucrose solution
• B) be from the sucrose solution into the tissue
• C) be in both directions and the concentrations would remain equal
• D) occur only as ATP was hydrolyzed in the tissue

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Definitions:

Isotonic

A solution that has the same solute concentration as another solution, preventing the movement of water across a semipermeable membrane.

Osmosis

The spontaneous movement of solvent molecules through a semi-permeable membrane from a region of lower solute concentration to one of higher solute concentration.

Translocation

The movement of substances within an organism or the transfer of genes or segments of chromosomes from one location to another.

Transpiration

The process by which moisture is carried through plants from roots to small pores on the underside of leaves, where it changes to vapor and is released into the atmosphere.