Question

Osmotic potential and pressure potential of three cells, a, b, c located in different parts of an actively transpiring plant are:

Cell	O.P (MPa)	P.P. (MPa)
a	-0.87	0.44
b	-0.92	0.34
c	-0.68	0.27

Which ones are root hair, root cortical and mesophyll cells respectively?

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

Answer 1

The correct option is C c, a, b

• Osmosis occurs only through the semi-permeable membrane. Osmosis is a gradient dependent process, osmosis is different from diffusion as it is characterized by a semi-permeable membrane.
  
• Net direction and rate of osmosis depend on both pressure gradient and concentration gradient.

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