TREE PHYSIOLOGY
TRANSPIRATION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Water moves into roots by active transport, moves up the phloem to the leaves where some evaporates through the stomata-this creates a suction to pulls up more water behind it.
|
|
|
Water moves into roots by osmosis, moves up the xylem to the leaves where some evaporates through the stomata-this creates a suction to pulls up more water behind it.
|
|
|
Water moves into roots by diffusion, moves up the xylem to the leaves where some evaporates through the guard cells-this creates a suction to pulls up more water behind it.
|
|
|
None of the above
|
Detailed explanation-1: -In plants, the transpiration stream is the uninterrupted stream of water and solutes which is taken up by the roots and transported via the xylem to the leaves where it evaporates into the air/apoplast-interface of the substomatal cavity. It is driven by capillary action and in some plants by root pressure.
Detailed explanation-2: -As transpiration occurs, it deepens the meniscus of water in the leaf, creating negative pressure (also called tension or suction). The tension created by transpiration “pulls” water in the plant xylem, drawing the water upward in much the same way that you draw water upward when you suck on a straw.
Detailed explanation-3: -Transpiration Keeps the Water Moving In plants, water enters the root cells by osmosis and moves into tubes called xylem vessels to be transported to the leaves. Water molecules inside the xylem cells are strongly attracted to each other because of hydrogen bonding (this is called cohesion).
Detailed explanation-4: -Water enters and leaves cells through osmosis, the passive diffusion of water across a membrane. In plants, water always moves from an area of higher water potential to an area of lower water potential.