Two cells A and B are contiguous. Cell A has osmotic pressure 10 atm, turgor pressure-7 atm and diffusion pressure deficit 3 atm. Cell B has osmotic pressure 8 atm, turgor pressure 3 atm and diffusion pressure deficit 5 atm. The result will be
(a) Movement of water from cell B to A
(b) No movernent of water
(c) Equilibrium between the two
(d) Movement of water from cell A to B
The translocation of organic solutes in sieve tube members is supported by:
(a) root pressure and transpiration pull
(c) mass flow involving a carrier and ATP
(d) cytoplasmic streaming
Substances that enter living cell by facilitated diffusion are
(a) generally polar in nature
(b) transported in the direction of concentration gradient
(c) transported with the help of carrier proteins
(d) all of the above
Transpiration is very important for plants because it helps in
(a) the absorption of water from soil
(b) the cooling of leaves at high temperature
(c) the movement of water and minerals absorbed by roots to various parts of the plant
(d) all of the above
Wooden doors swell up and get stuck during the rainy season. This is due to the phenomenon of
In plants, water moves from
(a) less negative to more negative potential
(b) more negative to less negative potential
(c) same potentials
(d) none of the above.
If turgor pressure becomes equal to the wall pressure, then
(a) water leaves the cell
(b) water enters the cell
(c) no exchange of water takes place
(d) solute goes from the cell into water.
Which of the following helps in ascent of sap?
(a) Root pressure
(d) All of these
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
What is correct about the movement of substance across the membrane in facilitated diffusion?
(a) It is an active transport.
(b) It cause transport of molecules from low concentration to high concentration.
(c) It is insensitive to inhibitors.
(d) It is a very specific transport.