Exam 34: Transport in Plants

In CAM plants, such as cacti, stomata are ____.

Water that moves through living cells in a root is following the ____.

Approximately ____ percent of water that enters a plant's roots is used for photosynthesis and other parts of metabolism and growth.

Translocation in sieve tubes requires passive transport.

Loading of most carbohydrates produced by photosynthesis into companion cells at a source occurs by ____.

Discuss permeability in plant cell walls.

Stomata generally close in response to ____.

The principal driving force for guttation is ____.

Individual plant cells typically gain or lose water mainly via ____.

Most mineral ions that plants need are moved into the ____.

Companion cells load most of the carbohydrates into sieve tube members ____.

Sieve elements differentiate through a process called ____ that causes the destruction of certain cell structures.

The loss of water vapor from aerial plant parts is called evapotranspiration.

In a wilted leaf, the protoplast has shrunk away from the cell wall.

Rising air temperatures at the leaf surface can increase evaporation, although evaporation can also cool a leaf somewhat.

If the ψ of surrounding soil is higher than that in living root epidermal cells, then water should ____.

Suppose two living plant cells are in contact with each other so that water, but not solutes, can pass between them. The cells have the same water potential. One cell has ψP = 0.3 MPa and ψS = -0.5 MPa, while the other cell has ψS = -0.3 MPa. What is the ψP of the second cell?

An air temperature rise of 10°C will typically ____ evaporation from leaves.

Consider a living plant cell in a living leaf that has a higher water potential than the fluids surrounding the cell. In such a situation there should be ____.

Stomata generally open in response to ____.