Bio Ch36 Activities Quiz

_____ is responsible for the movement of sugars from leaves to taproots; _____ is responsible for the movements of sugar from taproots to leaves.

Bulk flow ... bulk flow ( In both situations the mechanism of movement is the same.)

_____ transport(s) sugars from leaves to, for example, taproots.

Phloem ( Phloem is responsible for the transport of sugars.)

At a sugar sink, sugar is removed from phloem by _____.

active transport ( Active transport moves sugar from phloem into a sugar sink.)

____ cells are the cells that regulate the opening and closing of stomata, thus playing a role in regulating transpiration.

Guard ( Guard cells regulate the opening and closing of stomata.)

Which of these are symbiotic associations?

mycorrhizae ( Mycorrhizae are mutualistic associations of roots and fungi.)

Water moves into phloem by _____.

osmosis ( Water moves down its concentration gradient into phloem by osmosis.)

Click on the diagram to start the animation. This is an animation of the movement of water and ions through the root _____.

via the apoplastic route ( The animation illustrates water and ions moving along a cell wall continuum.)

In roots the _____ forces water and solutes to pass through the plasma membranes of _____ cells before entering the _____.

Casparian strip ... endodermis ... xylem ( The Casparian strip is a waterproof barrier that forces water and solutes to pass through the plasma membranes of endodermis cells.)

____ bonds are responsible for the cohesion of water molecules.

Hydrogen ( Hydrogen bonds among water molecules are responsible for the tendency of those molecules to stick together.)

_____ provide(s) the major force for the movement of water and solutes from roots to leaves.

Transpiration ( Transpiration, the evaporation of water from leaves, exerts a pull that bears the primary responsibility for the movement of water and solutes from roots to leaves.)

The water pressure that pushes water and sugar from sugar source to sugar sink is referred to as _____.

bulk flow ( Bulk flow is the force responsible for the translocation that occurs in phloem.)

Which of these processes is responsible for leaves being considered sugar sources?

photosynthesis ( Leaves produce sugar via photosynthesis.)

The channels indicated by the pointer, are _____.

plasmodesmata ( Water and ions can pass from cell to cell via these channels. Also, recall that plasmodesmata are a type of cell junction.)

Sugar moves from leaves into the _____ of _____ by _____

sieve-tube members ... phloem ... active transport

In a sugar sink, such as a taproot, sugar is converted into _____.

starch ( Plants store carbohydrates in the form of starch.)