Tag: absorption by roots - the processes involved

Questions Related to absorption by roots - the processes involved

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'.

Choose the best definition for 'diffusion' from the following.

bio-chemistry absorption by roots - the processes involved diffusion transport across membrane means of transport

  1. Passive movement from an area of greater concentration to one of lesser concentration

  2. Active movement from an area of greater concentration to one of lesser concentration

  3. Passive movement from an area of lesser concentration to one of greater concentration

  4. Active movement from an area of lesser concentration to one of greater concentration

Show answer
Correct Option: A
Explanation:

Diffusion is a type of passive transport which do not require expenditure of cellular energy for the net movement of a substance from a region of high solute concentration to a region of low solute concentration. This is also referred to as the movement of a substance down a concentration gradient.

Different substances move independently depending on their own concentration gradients in?

bio-chemistry absorption by roots - the processes involved diffusion transport across membrane means of transport

  1. Simple diffusion

  2. Bulk flow

  3. Osmosis

  4. All the above

Show answer
Correct Option: A
Explanation:

Diffusion is a passive movement of molecules along their concentration gradient. While osmosis is the diffusion of water molecules through a differentially permeable membrane or semipermeable membrane.


So the correct option is "Simple diffusion". 

Diffusion pressure is directly proportional to:

bio-chemistry absorption by roots - the processes involved diffusion transport across membrane means of transport

  1. Concentration of molecules diffusing

  2. Kinetic energy of diffusing molecule

  3. Concentration gradient

  4. All of the above

Show answer
Correct Option: A
Explanation:

The same conditions of temperature and pressure, the molar mass is proportional to the mass density. Therefore, the rate of diffusion of different gases is inversely proportional to the square root of their mass densities.

So, the correct option is 'Concentration of molecules diffusing'.

Rate of diffusion of $CO _2$ is $20$ times higher than $O _2$, as it depends upon?

bio-chemistry absorption by roots - the processes involved diffusion transport across membrane means of transport

  1. Solubility of gases

  2. Partial pressure

  3. Thickness of membrane

  4. All of these

Show answer
Correct Option: D
Explanation:

Gas exchange is the process that occurs between oxygen and carbon dioxide. Oxygen is passed from the lungs to the bloodstream and carbon dioxide is eliminated from the bloodstream to the lungs. Exchange of Gas takes place in lungs between the alveoli and capillaries which are tiny blood vessels, placed at the walls of alveoli. The rate of diffusion depends on the thickness of the biological membrane which forms the boundary between the external environment and organisms.

Gas exchange takes place by simple diffusion based on a concentration/pressure gradient. The rate of diffusion depends not only on the solubility of gases but also on the thickness of the membranes involved in gas exchange.
So the correct answer is 'All of these'.

Movement of gases across plasma membrane occurs through ______________

bio-chemistry absorption by roots - the processes involved diffusion transport across membrane means of transport

  1. Osmosis

  2. Diffusion

  3. Imbibition

  4. None of these

Show answer
Correct Option: B
Explanation:

Diffusion is a process in which the gaseous molecules spreads due to their kinetic energy and movement of molecules from their higher concentration to their lower concentration. Hence, The correct answer is option B.

A bottle of perfume is opened in the room opposite to you and within minutes you begin to smell the perfume. This phenomenon is a classic example of

bio-chemistry absorption by roots - the processes involved diffusion transport across membrane means of transport

  1. Dialysis

  2. Osmosis

  3. Active transport

  4. Diffusion

Show answer
Correct Option: D
Explanation:

Diffusion is the process of spreading of the gaseous molecule according to their kinetic energy. In this process, particles move from an area of high concentration to an area of low concentration. If the perfume is sprayed in one corner of a room, it will be smelt soon after in the opposite corner. Since the perfume molecules are in constant random motion they bump into each other causing some molecules to be occasionally sent hurtling out of the mass. Gradually, the molecules spread out.