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Question

Study the following table showing the components of water potential of four cells of an actively transpiring plant.
CellSolute potentialPressure potential(MPa)(MPa)A0.680.42B0.750.36C0.830.47D0.570.29
Identify the four cells as root hair, cortical cell, endodermal cell (lacking casparian strips) and pericycle cell respectively in the young root (assuming symplastic water flow through them).



A

B, D, C, A

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B

D, A, C, B

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C

A, D, C, B

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D

A, C, B, D

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Solution

The correct option is C

A, D, C, B


The movement of water from one cell to another cell through the plasmodesmata is called the symplast pathway. It occurs in the following sequence:
Root hair Epidermis Cortex Endodermis Pericycle Xylem
Solute potential (ψs) and pressure potential (ψp) are two components of water potential. Water potential can be calculated using the formula:
(ψw=ψs+ψp)
Water always flows from higher potential to lower potential. The water potential values of the four given cells are:
- 0.68 + 0.42 = - 0.26
-0.75 + 0.36= - 0.39
- 0.83 + 0.47 = - 0.36
- 0.57 + 0.29 = - 0.28
So, the correct sequence of the flow of water is A  B.
Thus, A, D, C and B respectively are the root hair, cortical cell, endodermal cell and pericycle cell.


Biology

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