Question

Components of water potential of four cells of an actively transpiring monocot plant are

Cell	Osmotic Potential	Pressure Potential
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, cortical cell, epidermal and pericycle cells.

• A. b, c, d, a
• B. b, d, c, a
• C. b, d, a, c
• D. a, d, b, c

Answer 1

The correct option is C b, d, a, c

Cell	osmotic potential	Pressure potential
a. Epidermal cell	-0.9	0.5
b. Root hair	-0.8	0.6
c. Pericycle cell	-0.6	0.1
d. Cortical cell	-0.7	0.4

When the T.S. of a root is taken then we can observe that the root hair are present externally and are in contact with the soil and have the highest pressure potential, the epidermis has a little lower pressure potential than it.

The cortex is a layer that is present after the epidermal layers so it's pressure potential further reduces. The pericycle is a layer embedded towards the centre and hence has the lowest pressure potential among these.

So the correct answer is 'b, d, a, c'.