Auxin _____. (select ALL that apply) a. is only transported by bulk flow through the xylem...

Auxin _____. (select ALL that apply)

	a.	is only transported by bulk flow through the xylem
	b.	increases the synthesis of proton pumps in a cell
	c.	after entering a cell, can simply move by diffusion into the next cell
	d.	promotes growth by allowing cell walls to loosen
	e.	activates a proton pump in a cell

Expert Solution

Answer - B, C, D and E

Weakly acidic hormone which is capable of cell elongtion (mainly in roots) having unsaturated ring is referred to as Auxin.
Their movement is polar. the polar transport is by active transport, with which thy move from one cell to another, mediated by carriers.
they can exist in both diffusable and bound forms. they can enter a cell in either non-ionised or protonated form. by the process named diffusion, these non-ionised forms enters the cell. so c is correct.
auxin is transported through pholem by an unregulated bulk flow. so a is incorrect
They allow the movement of H+ ions to move towards cell wall from cytoplasm, through proton pumps. thus activating the proton pumps. thus a acidic environment is established, which loosens the cell wall by weakening the interconnections of cellulose fibers. and also promotes further loosening by activating certain enzymes that can promote cellwall breakdown. So , they allows the cell elongation by further increasing the proton pump, thus allowing more water to enter into the stem through loosened cell wall. so b, d and e are correct

gladiator answered 3 years ago

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