Exam 9: Water in Plants

Approximately how much water typically leaves the plant by transpiration?

Substances are absorbed and retained against a concentration gradient, through the expenditure of energy, by ________.

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

Osmotic potential is the amount of pressure needed to make water rise in a narrow tube.

Which of the following plays a role in plasmolysis?

An area within a plant where food is utilized is called a

The rise of water in plants is presently most satisfactorily explained by

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

Tension in the leaf xylem is due to the adhesive and cohesive properties of water as well as transpiration.

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

Many studies leading to our present knowledge of translocation of food in plants utilized radioactive tracers and

________ occurs when water forms hydrogen bonds with large organic molecules such as cellulose in living or dead tissues.

Most plants have their stomata closed during the day and open at night.

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

The process of loading and transport of food through the phloem tissue involves which of the following factors?

Most of the water that enters a plant via the roots leaves the same plant by the process of

Hydroponically grown tomatoes are those that are grown in

When an entire plant wilts, it is due to ________.

During plasmolysis water leaves a cell's central vacuole.

Plants obtain most of their mineral nutrients ________.