Question

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

Cell	Osmotic potential	Pressure potential
	(MPa)	(MPa)
A	-0.9	0.5
B	-0.8	0.6
C	-0.6	0.1
D	-0.7	0.4

Identify the four cells as root hair, general cortical cell, passage cell and pericyclic cells of young root respectively (assume symplast flow).

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

Answer 1

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

The water potential of the following cells are - A = -0.4, B = -0.2, C = -0.5, D = - 0.3. The water potential is highest in the hoot hair and it lowers towards the inside of the root and stem. Here B cell has highest water potential, so It should be root hair. After that D has high water potential, so it is cortical cell. Thus, A is passage cell and C is pericycle, as it has lowest water potential.