- an osmometer is filled with 0.5 M solution of NaCl in
water. In which of the following solutions it must be
immersed in order to make it shrink?
(a) 0.5 M solution
(b) 0.05 M solution
(c) Distilled water
(d) 0.75 M solution (Karnataka 2012)
- Living cells placed in isotonic solution (0.9% saline) retain
their size and shape. This is based on the concept of
(a) osmosis (b) diffusion
(c) facilitated diffusion (d) transpiration.
(WB JEE 2012)
- Which of the following is not true for active transport?
(a) It is a chemical process.
(b) energy is required for this process which is obtained
in the form of aTP.
(c) It takes place through special organic molecules
called carrier molecules.
(d) This process is not modified by enzymes.
(Odisha 2012)
- The ability to rise in thin tubes and the ability to resist a
pulling force are respectively referred to as
(a) tensile strength and capillarity
(b) adhesion and capillarity
(c) cohesion and adhesion
(d) cohesion and capillarity
(e) capillarity and tensile strength.
(Kerala 2012)
- Consider the following statements with reference to
facilitated transport.
a. requires aTP energy.
b. Transports saturates.
C. Highly selective.
D. requires special membrane properties.
e. uphill transport.
Of the above statements
(a) a, b and C are relevant but D and e are irrelevant.
(b) b, C and e are relevant but a and D are irrelevant.
(c) C, D and e are relevant but a and b are irrelevant.
(d) a, D and e are relevant but b and C are irrelevant.
(e) b, C and D are relevant but a and e are irrelevant.
(Kerala 2012)
- Which of the following criteria does not pertain to
facilitated transport?
(a) Transport saturation
(b) uphill transport
(c) requirement of special membrane proteins
(d) High selectivity
(NEET 2013)
18. a thin film of water covering the soil particles and held
strongly by attractive forces is called
(a) run away (b) hygroscopic
(c) gravitational (d) capillary.
(K-CET 2013)
19. When the concentration of the solutes is low in plant
cell, absorption of water is
(a) retarded (b) increased
(c) normal (d) absent. (AMU 2014)
20. Select the wrong statement.
(a) Cells swell in hypertonic solutions and shrink in
hypotonic solutions.
(b) Water potential is the kinetic energy of water which
helps in the movement of water.
(c) The absorption of water by seeds and dry wood
takes place by a special type of diffusion called
imbibition.
(d) Solute potential or ys is always negative.
(e) Less than 1% of the water reaching the leaves is
used in photosynthesis and plant growth.
(Kerala PMT 2014)
Assertion & Reason
The following questions consist of two statements each :
assertion (a) and reason (r). To answer these questions,
mark the correct alternative as directed below :
(a) If both a and r are true and r is the correct explanation
of a.
(b) If both a and r are true but r is not the correct
explanation of a.
(c) If a is true but r is false.
(d) If both a and r are false.
- Assertion : To counteract the increase in turgor
pressure in plant cells, the cell wall produces an equal
and opposite pressure, called wall pressure.
Reason : When plant cells are placed in a hypotonic
solution they undergo endosmosis, and swell-up but do
not burst.
- Assertion : The presence of solute particles increases
the free energy of water.
Reason : Water moves from a more negative water
potential to less negative one.
- Assertion : Imbibition is a phenomenon of absorption
of water or any other liquid by the solid particles of a
substance, without forming a solution.
Reason : Cellulose and lignin are more powerful
imbibants than proteins.
