Exam 34: Transport in Plants

Sucrose moves into a cell against its concentration gradient at the same time that protons move into the cell along their concentration gradient. This is an example of ____.

The loss of water vapor from aboveground plant parts is called ____.

An ant that consumes the "honeydew" from an aphid's anus benefits by obtaining a source of carbon.

The majority of the water in xylem sap typically ____.

According to the cohesion-tension mechanism of water transport, cohesion occurs because ____.

According to the cohesion-tension mechanism of water transport, ____ does not contribute to the flow of the xylem sap.

Suppose a living plant cell has ψP = 0.4 MPa and ψS = -0.5 MPa. If the plant cell is placed into a beaker filled with a solution with ψ = ψS = -0.9 MPa, then the cell should ____.

The root-to-shoot water flow in a plant is called the transpiration stream.

In most plants, stomata are ____.

The general term for long-distance transport of substances in plants is called ____.

When solutes are unloaded from phloem, water ____.

The ____ prevent(s) important substances in the xylem from leaking into the root cortex.

The longest limb on the Angel Oak on Johns Island, South Carolina, is ____.

The typical movement of xylem sap from roots to shoot parts is best described as ____.

Stomata are opened when ____ guard cells and they become ____.

Describe how NO₃^-is transported into a plant cell.

Root epidermal cells passively transport ions inward from the soil because the ions are unable to follow a concentration gradient into the cells.

Water can move inside a root via the ____.

A cell expends energy when moving substances against a gradient during ____.

The membrane potential refers to the ____ across a cell membrane.