Question

In: Biology

Which description of water potential measurements within a plant's tissues lead you to conclude that transpiration...

Which description of water potential measurements within a plant's tissues lead you to conclude that transpiration is freely occuring?No information is given on the guard cells.

a)soil water potential= -5.0,root water potential= -7.0,stem water potential= -10.5,spongy mesophyll water potential= -12.0,air water potential =0.0

b)soil water potential= -5.0,root water potential= -7.0,stem water potential= -10.5,spongy mesophyll water potential= -12.0,air water potential= -98.0

c)soil water potential= -8.0,root water potential= -7.0, stem water potential = -7.0 spongy mesophyll water potential= -7.0, air water potential= -98.0

d) soil water potential= -12.0, root water potential= -10.0,stem water potential= -9.5, spongy mesophyll water potential = -9.0, air water potential= -98.0

Expert Solution

Consider the first option:

soil water potential= -5.0, root water potential= -7.0, stem water potential = -10.5, spongy mesophyll water potential= -12.0, air water potential =0.0

Note that water moves from higher water potential to lower water potentail.

Since the water potentail of soil is higher than the root water potential, water moves from soil into root.

As the water potential of root is higher than the water potential of stem, water moves from root into stem.

As the water potential of stem is higher than the water potential of mesophyll cells, water moves from stem to mesopyll cell

As the water potential of mesophyll cell is lower than the water potential of air, water will not move from mesophyll cell to air (as avapours). hence no transpiration

Consider the second option:

soil water potential= -5.0,root water potential= -7.0,stem water potential= -10.5,spongy mesophyll water potential= -12.0,air water potential= -98.0

Since the water potentail of soil is higher than the root water potential, water moves from soil into root.

As the water potential of root is higher than the water potential of stem, water moves from root into stem.

As the water potential of stem is higher than the water potential of mesophyll cells, water moves from stem to mesopyll cell

As the water potential of mesophyll cell is much higher than the water potential of air, water will move from mesophyll cell to air (as avapours). hence free transpiration occurs.

Consider the Third option:

soil water potential= -8.0,root water potential= -7.0, stem water potential = -7.0 spongy mesophyll water potential= -7.0, air water potential= -98.0

Since the water potentail of soil is lower than the root water potential, water will not move from soil into root. Hence it will not move further and no transpiration.

Consider the fourth option:

soil water potential= -12.0, root water potential= -10.0,stem water potential= -9.5, spongy mesophyll water potential = -9.0, air water potential= -98.0

Since the water potentail of soil is lower than the root water potential, water will not move from soil into root. Hence it will not move further and no transpiration.

Therefore option B is correct one.

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gladiator answered 1 year ago

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