Which is the following is not a component of the symplast?

• sieve tube members

• xylem tracheids

• endodermal cells

• cortex cells

the Casparian strip prevents water and minerals from entering the vascular cylinder through the

• plasmodesmata

• endoderml cells

• symplast

• apoplast

Gutation result from

• the pressure flow of sap through phloem

• a water vapor break in the coloumn of xylem sap

• a higher water potential of the leaves than of the roots

• a root pressure causing water to flow up through xylem faster than it can lost by transpiration

which of these is not a major factor in the movement of xylem sap up a tall tree?

• transpiration

• plasmodesmata

• cohesion

• tension

adhesion is a result of

• hydrogen bonding between molecule of water

• the pull of the water column as water evaporates from surfaces of mesophyll cells

• tension within the xylem caused by negative pressure

• the high surface tension of water

• attraction of water molecules to hydrophilic walls of narrow xylem tubes

By what method do most mineral anions enter root cells?

• bulk flow

• cotransport using proton gradient

• diffusion

• apoplast

what mechanism explains the movement of sucrose from source to sink?

• tension created by the differences in pressure in the source and sink

• active transport of sucrose through the sieve tube cells driven by proton pumps

• the hydrolysis of starch to sucrose in the mesophyll cells that raise their water potential and drives the bulk flow of sap to the sink

• osmotic movement of water into the sucrose loaded sieve tube members creating a higher pressure in the source than in the sink

choose the component of apoplast

• 1

• 2

• 3

• 4

choose the components in symplast.

• 1

• 2

• 3

• 4

choose the components in transmembrane route.

• 1

• 2

• 3

• 4