(ii) a membrane which allows some substances to
pass through it more readily than others is known
as selectively/ differentially permeable.
(iii) all living biological membranes are perfectly semi-
permeable.
(a) (i) and (ii) (b) (ii) and (iii)
(c) (i) and (iii) (d) (i), (ii) and (iii)- Power of imbibition is excellent in
(a) cellulose (b) starch
(c) proteins (d) lipids. - Deplasmolysis is carried out by placing the plasmolyzed
cell in
(a) saturated solution (b) water
(c) isotonic solution (d) hypertonic solution. - Water holding capacity of a soil is dependent upon
(a) size of soil particles
(b) macro and micro elements of soil
(c) critical elements of soil
(d) rainfall or annual precipitation. - Plants absorb from soil
(a) hygroscopic water (b) capillary water
(c) gravitational water (d) none of these.
Exam Section
- a cell when dipped in 0.5 M sucrose solution has no
effect but when the same cell is dipped in 0.5 M NaCl
solution the cell will
(a) increase in size (b) decrease in size
(c) will be turgid (d) will get plasmolyzed.
(AFMC 2005) - The lowest water potential is found in
(a) leaves (b) xylem
(c) root hair (d) phloem. (AMU 2008) - addition of solute in the cell develops
(a) TP (b) OP
(c) DP (d) WP. (AFMC 2008) - Most of the water flow in the root takes place via the
apoplast because
(a) cortical cells are loosely arranged
(b) cortical cells are living cells
(c) cortical cells are thin walled cells
(d) all of the above. (AMU 2009) - Cell a and cell b are adjacent plant cells. In cell a,
ys = –20 bars yp = 8 bars. In cell b, ys = –12 bars and
yp = 2 bars. Then,
(a) water moves from cell a to cell b.
(b) there is no movement of water between cell a and
cell b.
(c) water moves from cell b to cell a.
(d) equal amount of water is simultaneously exchanged
between cell a and cell b.
(Karnataka 2010)- What do a, b, C, and D represent in the following
figure?
(a) a : carrier protein, b: symport, C: uniport, D : antiport
(b) a : carrier protein, b : uniport, C: antiport, D : symport
(c) a : carrier protein, b : antiport, C: symport, D : uniport
(d) a : carrier protein, b : uniport, C: symport, D : antiport
(AIIMS 2010)- The process by which water is absorbed by solids like
colloids causing them to increase in volume is called
(a) osmosis (b) plasmolysis
(c) imbibition (d) diffusion
(e) facilitated diffusion.
(Kerala 2011) - The space between the plasma membrane and the cell
wall of a plasmolyzed cell surrounded by a hypertonic
solution is occupied by the
(a) hypotonic solution
(b) isotonic solution
(c) hypertonic solution
(d) water. (Karnataka 2011) - The force responsible for upward conduction of water
against gravity comes from
(a) transpiration (b) photosynthesis
(c) translocation (d) respiration.
(Karnataka 2011) - Two per cent solution of NaOH as compared to 18 per
cent solution of glucose is
(a) isoosmotic
(b) hypoosmotic
(c) hyperosmotic
(d) none of these. (AMU 2011) - root pressure is due to
(a) passive transport (b) gravitation
(c) active transport (d) none of these.
(Odisha 2011)