Wooden doors swell up and get stuck during the rainy season. This is due to the phenomenon of
imbibition
endosmosis
capillarity
deplasmolysis
A.
imbibition
Jamming of wooden frames during rains is caused by swelling of wood due to imbibition. (The absorption of water by the solid particles of a substance without forming a solution is called imbibition).
Good soil is :
which holds whole of the water that enters into it
which allows percolating the water slowly from it
which allows water to pass very quickly from it
which allows limited amount of water to retain into it
In plants, water moves from
less negative to more negative potentia
more negative to less negative potential
same potentials
none of the above
Choose the wrong statement
Cells swell in hypertonic solutions and shrink in hypotonic solutions
Water potential is the kinetic energy of water which helps in the movement of water
The absorption of water by seeds and dry wood takes place by a special type of diffusion called imbibition
Solute potential or PS is always negative
Solute potential or PS is always negative
Which of the following statements about the mass flow hypothesis is wrong?
It is the accepted mechanism for translocation of sugars from source to sink
As glucose is prepared at source it is converted to sucrose
Sucrose is actively loaded into a sieve tube
The process of loading at source produces a hypotonic condition in the phloem
The process of loading at source produces a hypotonic condition in the phloem
If turgor pressure becomes equal to the wall pressure, then
water leaves the cell
water enters the cell
no exchange of water takes place
solute goes from the cell into water
Match the following and choose the correct option.
| Column I | Column II |
| A. Water potential | i. It is usually positive |
| B. Solute potential | ii. It is zero for pure water |
| C. Pressure potential | iii. It is always negative |
A - ii; B - iii; C - i
A - i; B - iii; C - ii
A - iii; B - ii; C - i
A - ii; B - i; C - iii
A - ii; B - i; C - iii
Which of these is/are not a property of facilitated transport?
(A) Requires special membrane proteins
(B) Highly selective
(C) Uphill transport
(D) Requires ATP energy
(A) and (B) only
(C) and (D) only
(A) and (C) only
(B) and (C) only
(B) and (C) only
Which of the following statements about plasmolysis is/ are true?
I . Plasmolysis occurs when water moves into the cell.
II. Cells shrink in hypotonic solutions.
III. If the external solution balances the osmotic pressure of the cytoplasm, it is said to be isotonic.
I only
II only
III only
I and II only
I and II only
Assertion : A plant girdled upto bast will die.
Reason : Food transportation in such plant will cease followed by ceasation of water transport.
If both Assertion and Reason are true and Reason is the correct explantion of Assertion
If both Assertion and Reason are true and Reason is not the correct explanation of Assertion
If Assertion is true but Reason is false
If Assertion is false but Reason is true
