Exam 34: Transport in Plants

Researchers studying the effects of uncontrolled water movement within roots might create mutant plants that lack Casparian strips, or _______, in the endodermis.These plants would not be able to prevent water and ions from moving through the cell wall space between cells.

Experiments with aphids have shown that phloem sap

Water enters the xylem tissue from surrounding root cells via

A plant cell placed in distilled water will

All of the following play a role in the closing of stomata except

The pumping of protons (H⁺) out of a cell can trigger the movement of

Bulk flow of water through xylem is stopped by

Which structure of the leaf most minimizes water loss?

The flow of K⁺ and Cl^- into guard cells is facilitated by

Which statement is true regarding the distinction between monocots and eudicots?

Which of the following is true regarding loading and unloading in phloem translocation?

As water enters a cell, turgor pressure increases because

Casparian strips are _______ layers in walls of _______ cells in roots.

Without a Casparian strip, which of the following would likely take place?

As a tree begins transpiring in the morning, tension occurs first in the

Which experimental observation contributed to a better understanding of translocation in the phloem?

When water enters the cell and the pressure potential balances the solute potential, the cell is said to be _______.

Were it not for leaves, which of the following would most likely happen to water in the xylem?

In the late 19th century, scientists performed an experiment in which a tree's roots were removed and the tree was placed in a vat of poison.The scientists were trying to test the hypothesis that roots were somehow responsible for pumping water through the tree to the roots.What did they discover?

Which of the following statements about the movement of potassium ions is true?