Exam 9: Water in Plants

The pressure required to prevent osmosis from taking place is referred to as:

The early scientist who suggested that cells surrounding xylem vessels perform a pumping action that propels water through a plant was

A hydathode is normally located at the tips of a leaf vein.

The direction of movement of food molecules in plants is ______________.

Water and solute molecules never have to enter a cell because they can travel from the epidermis to the root xylem by moving through the cell walls and spaces between cell walls.

All essential macro- and microelements exist as part of organic molecules in the plant except

Changes in solute ion concentrations that are involved in the opening and closing of stomata pertain primarily to which of the following?

Some sort of physiological pump is believed to be involved in active transport.

Which of the following is an essential micronutrient?

Pressure sufficient to prevent the rise of fluid in an osmometer tube, when applied to the top of the tube, is called

At present the most widely accepted theory for movement of sugars in the phloem is called the

Osmosis is a special kind of diffusion in which water molecules

Hydathodes are involved directly in which of the following?

When a solute is dissolved in water, the ___________________ of the water is lowered.

The cohesion of water molecules and their adhesion to the walls of narrow tubes that results in water rising in the tubes is called

Active transport in plants apparently involves an enzyme complex that forms a/an __________.

A differentially permeable membrane is one that permits anything up to the size of large molecules to pass through.