Question

Study the following table showing the components of water potential of four cells of an actively transpiring plant.

Cell	Solute potential (MPa)	Pressure potential (MPa)
A	- 0.68	0.42
B	- 0.75	0.36
C	- 0.83	0.47
D	- 0.57	0.29

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
• B. D, A, C, B
• C. A, D, C, B
• D. A, C, B, D

Answer 1

The correct option is C A, D, C, B

Cell A, B, C, D has water potentials respectively -0.26, -0.39, 0.36 and 0.28. So, A is root hair as it has highest water potential. When we go to towards the centre of the stem the water potential decreases. So, the B is pericycle, C is endodermal cell and D is cortical cell, as they are present towards the periphery respectively.