Osmosis

Question 1

The … is freely permeable to water and substances in solution hence is not
a barrier to movement.

Answer 1

cell wall
to movement.

Question 2

In plants the cells usually contain a large .. whose contents, the vacuolar sap, contribute to the …

Answer 2

central vacuole
solute potential of the cell.

Question 3

In plant cells, …nd… together are important determinants of
movement of molecules in or out of the cell.

Answer 3

the cell membrane and the membrane of the vacuole, the tonoplast

Question 4

Osmosis is the term used to refer …

Answer 4

specifically to the diffusion of water across a differentially- or semi-permeable membrane.

Question 5

Osmosis occurs
spontaneously in response to …

Answer 5

driving force.

Question 6

The net direction and rate of
osmosis depends on both the ..

Answer 6

pressure gradient and concentration gradient.

Question 7

Water will move from its region of …to… until equilibrium is reached.

Answer 7

higher chemical potential (or concentration)
to its region of lower chemical potential

Question 8

At equilibrium the two chambers should have the … water potential.

Answer 8

same

Question 9

If the tuber is placed in water, the cavity in the potato tuber
containing a concentrated solution of sugar collects water due to …

Answer 9

osmosis.

Question 10

Experiment

Answer 10

External pressure can be applied from the
upper part of the funnel such that no water
diffuses into the funnel through the membrane.
This pressure required to prevent water from
diffusing is in fact, the osmotic pressure and this
is the function of the solute concentration; more
the solute concentration, greater will be the
pressure required to prevent water from diffusing
in. Numerically osmotic pressure is equivalent
to the osmotic potential, but the sign is
opposite.Osmotic pressure is the positive
pressure applied, while osmotic potential is
negative.