Tag: transport across membrane

Questions Related to transport across membrane

If cells of onion peel and RBC are separately kept in hypotonic solution, what among the following will take place?

bio-chemistry absorption by roots - the processes involved osmotic relations of plant cells transport across membrane imbibition and its importance

  1. Both the cells will swell

  2. RBC will burst easily while cells of onion peel will resist the bursting to some extent

  3. A and B both are correct

  4. RBC and onion peel cells will behave similarly

Show answer
Correct Option: C
Explanation:

Hypotonic solution is a solution which contains lesser solute concentration. If RBC is kept in hypotonic solution then the water molecules will move from hypotonic solution to RBC. This process is called as osmosis in which the water molecules move from lower solute concentration to higher solute concentration through cell membrane RBC. Due to this, the cell membrane of RBC will not be able to tolerate the pressure and it will burst eventually. 
If onion peel is kept in hypotonic solution then the water molecules will move from hypotonic solution to onion cells. This process is called as osmosis in which the water molecules move from lower solute concentration to higher solute concentration through the cell wall of onion. As onion cell possess cell wall along with the cell membrane the onion cell will take a longer time to burst than RBC but it will burst eventually. 
So, the correct answer is option B.

Cells of onion peel and RBC are separately kept in hypotonic solution, what among the following will take place?

bio-chemistry absorption by roots - the processes involved osmotic relations of plant cells transport across membrane imbibition and its importance

  1. Both the cells will swell

  2. RBC will burst easily while cells of onion peel will resist the bursting to some extent

  3.  RBC and onion peel cells will behave similarly

  4. Both A and B

Show answer
Correct Option: D
Explanation:

When the cells are kept in a hypotonic solution, endosmosis occur, i.e., inward movement of water. This results in the swelling up of the cells. The RBCs burst easily because they are animal cells and do not have cell wall. The onion peel possess cell wall which makes it resistant to bursting due to swelling caused by endosmosis. Therefore, option D is correct.

What will happen when a Red Blood Cell (RBC) is kept in concentrated saline solution?

bio-chemistry absorption by roots - the processes involved osmotic relations of plant cells transport across membrane imbibition and its importance

  1. It will lose water and shrink

  2. It will absorb water and swell

  3. It will be remain unaffected

  4. None of the above

Show answer
Correct Option: A
Explanation:

When RBCs are kept in concentrated saline solution then such solution is said to be hypertonic. Hence, exosmosis i.e., water will move from inside to outside of RBC through its cell membrane due to this, RBCs will shrink.

So, the correct answer is option A.

Choose the correct answers from the alternatives given :
The relationship between osmotic pressure, turgor pressure and wall pressure is represented by

bio-chemistry absorption by roots - the processes involved osmotic relations of plant cells transport across membrane imbibition and its importance

  1. TP=OP+WP

  2. OP=TPWP

  3. WP = TP OP

  4. OP = TP + WP

Show answer
Correct Option: B
Explanation:

Wall pressure is equal and opposite to the turgor pressure.

TP =  WP 
Also, DPD/SP = OP- WP 
           WP = TP 
        DPD = OP - TP 
In fully turgid cells, turbo pressure is equal to osmotic pressure. Hence, division pressure deficit is zero in such case 
           OP = TP (in turgid cell) 
           DPD = 0 (zero) 
In fully plasmyzed cells, the value of turgor pressure becomes zero due to decrease in TP and increase of OP.
       TP = 0 
      SP/DPD = OP (in plasmolyzed cells) 
Now a days water potential is used which is equal to DPD.
    WP = DPD 
So, the correct option is 'Op= TP WP'.

Most common type of absorbent for $H _{2}S$ removal is

biology transport in plants osmotic relations of plant cells transport across membrane imbibition and its importance

  1. Lead

  2. ethanolamines

  3. Fluorides

  4. CO

Show answer
Correct Option: B

According to fluid mosaic model (proposed by Singer and Nicolson), plasma membrane is composed of 

biology transport in plants osmotic relations of plant cells transport across membrane imbibition and its importance

  1. Cellulose, hemicellulose

  2. Phospholipid and integrated protein

  3. Phospholipid, extrinsic protein, intrinsic protein

  4. Phospholipid and hemicellulose

Show answer
Correct Option: C
Explanation:
According to fluid mosaic model, plasma membranes are quasifluidic structures with a viscous lipid bilayer made up of phospholipids having proteins at places distributed as mosaic both on the surface and inside. Singer and Nicolson have described cell membrane as protein icebergs floating in sea of lipids. External proteins are called extrinsic proteins or peripheral proteins while the internal proteins are named intrinsic or integral.
So, the correct answer is 'Phospholipid, extrinsic protein, intrinsic protein'.

The cell membrane engulfs its food by a process called as 

biology transport in plants osmotic relations of plant cells transport across membrane imbibition and its importance

  1. Exocytosis

  2. Endocytosis

  3. Osmosis

  4. Diffusion

Show answer
Correct Option: B
Explanation:

Endocytosis is the process in which cells absorb molecules by engulfing them. The cell membrane engulfs food and other materials by endocytosis. The plasma membrane creates a small deformation inward, called as an invagination, in which the substance to be transported is captured. The deformation then pinches off from the membrane on the inside of the cell, creating a vesicle containing the captured substance. Endocytosis is a pathway for internalizing solid particles, small molecules and ions and macromolecules. Endocytosis requires energy and is thus, a form of active transport.

Thus, the correct answer is 'Endocytosis'.

Water uptake in Imbibition takes place through ________

botany transport in plants osmotic relations of plant cells transport across membrane imbibition and its importance

  1. Absorption

  2. Adsorption

  3. Sorption

  4. All of the above

Show answer
Correct Option: A
Explanation:

Imbibition is a special type of diffusion when water is absorbed by solids- colloids causing an enormous increase in volume. Examples include the absorption of water by seeds and dry wood.

Imbibition occurs due to?

botany transport in plants osmotic relations of plant cells transport across membrane imbibition and its importance

  1. Increase in volume of imbibate

  2. Adsorption of imbibate by imbibant

  3. Absorption of imbibant by imbibate

  4. Loss of energy in the form of heat

Show answer
Correct Option: A
Explanation:
Imbibition is a special type of diffusion when water is absorbed by solids and colloids causing an enormous increase in volume. The substance that imbibes water is called imbibant, and the liquid which is imbibed is called imbibate. Imbibition occurs due to the increase in the volume of imbibate.

 Hence, the correct answer is option A.

Which of the following statements is correct?

botany transport in plants osmotic relations of plant cells transport across membrane imbibition and its importance

  1. Cells shrink in hypertonic solution and swell in hypotonic solution.

  2. Imbibition is a special type of diffusion when water is absorbed by no living parts.

  3. Most of water flow in the roots occur via the apoplast.

  4. All of the above

Show answer
Correct Option: D
Explanation:

Following are the correct statements: 

(1) Cells shrink in a hypertonic solution and swell in the hypotonic solution.
(2) Imbibition is a special type of diffusion when water is absorbed by no living parts.
(3) Most of the water flow in the roots occur via the apoplast.
So, the correct answer is (d).