Exam 34: Transport in Plants

A botanist studying a well-watered plant observes that its weight is decreasing steadily and that smearing petroleum jelly on the bottoms of its leaves stops this weight loss.The best conclusion is that the weight loss is due to water loss through _______.

If a solute in an aqueous solution is at a higher concentration on one side of a selectively permeable membrane than on the other side, which of the following is expected to occur?

A plant is most likely to wilt when _______ in leaf cells.

Water cannot pass through the _______ in the endodermis of the root.

You spot a wilted impatiens plant on the windowsill.This wilting occurs when the _______ of a plant's cells is _______.

Active transport is essential for

Capillary action is propelled principally by

The movement of photosynthates into the phloem is called

In what way does the transportation of phloem sap require metabolic energy?

A newly discovered kind of coconut plant has leaves with increased uptake of CO₂ compared to leaves of other types of coconuts.What modification might best account for the difference?

Cells in the leaf release abscisic acid in response to

A researcher injects tritium-labeled water low on the stem of a plant to follow transport activity.When this tritium-labeled water is found in the sap of mature leaf phloem, it can be traced back to its injection site in the stem

In order to transport K⁺ ions into their cells, plants use

Cell walls and spaces between cells make up a compartment called the _______.

If you were able to experimentally force a plant to close its stomata while in the light, which of the following might you expect to happen immediately within the leaves?

The general purpose of a sink (for a plant) is to

Cohesion is the tendency of water molecules to attract _______ molecules by means of _______ bonds.

Minerals taken up in their ionic form are moved into root cells against their concentration gradient by the process of _______ transport.

The roots of the "semi-rheophytic" tropical orchid contain structures adapted from its leaves that provide for rapid uptake of water during the heavy but sporadic tropical rainstorms.These structures, which are composed of pairs of cells that create large pores, resemble the _______ of leaves.

What gives plants the ability to effectively move water between cells?