Transport in Plants Test

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Transport in Plants Test - 33

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Question 1
1 / -0

Plasmolysis can be used for

A
Good growth of plants

B
Good growth of weeds

C
Killing the weeds

D
None of the above

Solution

Plasmolysis is lysis of living substance protoplasm. It results from loss of water from a cell and is characterised by shrinking of protoplasm. Weeds can be controlled by plasmolysis by making the soil hypertonic as compared to cell sap. However, it will also make absorption of water difficult for crop plants. Thus, the correct answer is option C.
Question 2
1 / -0

Osmotic potential is numerically equal to

A
Turgor pressure

B
Wall pressure

C
Osmotic pressure

D
D.P.D.

Solution

According to previous concept water moves due to diffusion pressure deficit or DPD, calculated as the difference between osmotic pressure and turgor pressure. As per the new concept water moves according to water potential gradient from a region of high water potential to a region of low water potential. Water potential is calculated as the sum of osmotic potential, pressure potential and matrix potential. Osmotic potential is numerically same as osmotic potential.
Question 3
1 / -0

The accurate relationship between SP, OP, TP can be expressed as

A
SP = OP + TP

B
OP = SP - TP

C
TP = SP - OP

D
SP = OP - TP

Solution

Diffusion pressure deficit (DPD) is same as suction pressure. DPD is calculated as the difference between osmotic pressure (OP) and turgor pressure (TP). The OP is the pressure responsible for gain of water and turgor pressure is the opposing pressure.
Question 4
1 / -0

The osmotic pressure is due to

A
Solute

B
Semi permeable membrane

C
Hypertonic solution

D
Water

Solution

Osmotic pressure is caused due to dissolved solutes in the solution. Osmotic pressure is the pressure, which is responsible for gain of water by cells due to the process of osmosis. More the concentration of solute particles in the solution, more will be osmotic pressure and this solution will gain water when placed in contact with a solution having less concentration of solute particles and consequently having lesser osmotic pressure.
Question 5
1 / -0

The best condition by which fully turgid cell can be identified is

A
TP is minimum

B
SP is maximum

C
OP less than SP

D
TP $$=$$ OP

Solution

DPD stands for diffusion pressure deficit. When more than one solutions are placed in contact, water moves from a region of low DPD to a region of high DPD. The value of DPD is calculated as the algebraic difference of osmotic pressure (OP) and turgor pressure (TP). In a fully turgid cell OP and TP are equal and hence, DPD is equal to zero.
Question 6
1 / -0

The direction of the movement of water

A
From low OP to high OP

B
From low DPD to high DPD

C
From high TP to low TP

D
All of the above

Solution

Diffusion pressure deficit (DPD) is otherwise known as suction pressure (SP). DPD is responsible for movement of water in a plant. Water moves from a region or cell of low DPD to a cell or region of high DPD.
In a fully turgid cell osmotic pressure is equal to turgor pressure and hence DPD is zero. If two cells have same DPD and are placed in contact, water will move from the cell having higher TP to the cell having lower TP, because the water cannot enter into the former cell due to higher opposing force.
Also as turgor pressure develops on entry of water, a higher value of TP means comparatively more water content in a cell. Similarly water will move from the cell having lower OP to the one having higher OP, because OP develops due to solute particles in the solution. A high OP means more solute particles and less solvent particles.
Question 7
1 / -0

The osmotic pressure of the cell is measured by

A
Plasmolysis method

B
Osmometer

C
Molar concentration of the cell sap

D
Deplasmolysis

Solution

Osmometer is a device used for measuring Osmotic strength, Osmotic Concentration or Pressure. Thus the correct option is B.
Question 8
1 / -0

Select the correct statement.

A
Pure water has minimum $$\psi_w$$.

B
Pure water has maximum $$\psi_w$$.

C
Pure water has maximum D.P.D.

D
Pure water has variable $$\psi_w$$ and DPD.

Solution

Water potential is also called as chemical potential of water. It depends on the number of water molecules in the system. More the number of water molecules, more the water potential. Water potential of pure water is maximum. By convention the water potential of pure water is fixed as zero. Thus, water potential of any solution is always negative. Water always flows from a region of high water potential to a region of low water potential.
Question 9
1 / -0

Maximum osmotic pressure is found in

A
Root hair

B
Cortex cell of the root

C
Passage cell of the root

D
Mesophyll cell

Solution

Osmotic pressure is caused due to dissolved solutes in the solution. Osmotic pressure is the pressure which is responsible for gain of water by cells due to the process of osmosis. More the concentration of solute particles in the solution, more will be osmotic pressure and this solution will gain water when placed in contact with a solution having less concentration of solute particles and consequently having lesser osmotic pressure. A plant gains water from soil along the route soil solution to root cortex to vascular tissue to leaf mesophyll. It is clear that along this route the leaf mesophyll cells should have maximum osmotic pressure, so that they are able to absorb water.
Question 10
1 / -0

Bacteria can not survive in a highly salted pickle, because

A
Salt inhibits reproduction of bacteria.

B
Enough light is unavailable for photosynthesis.

C
They become plasmolysed and death occurs.

D
Nutrients in the pickle medium can not support life.

Solution

Water molecules move from a region of their high concentration (less concentrated solution) to a region of their low concentration (highly concentrated solution). Thus, solutions having high salt or sugar concentration absorb water from less concentrated solutions. If bacteria are exposed to very high salt or sugar concentration, they will lose water and their cell contents will become plasmolyzed, resulting in their death.

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Re-Attempt Weekly Quiz Competition

Transport in Plants Test - 33

Result

Transport in Plants Test - 33

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Rank

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SHARING IS CARING

Question 1

Good growth of plants

Good growth of weeds

Killing the weeds

None of the above

Solution

Question 2

Turgor pressure

Wall pressure

Osmotic pressure

D.P.D.

Solution

Question 3

SP = OP + TP

OP = SP - TP

TP = SP - OP

SP = OP - TP

Solution

Question 4

Solute

Semi permeable membrane

Hypertonic solution

Water

Solution

Question 5

TP is minimum

SP is maximum

OP less than SP

TP $$=$$ OP

Solution

Question 6

From low OP to high OP

From low DPD to high DPD

From high TP to low TP

All of the above

Solution

Question 7

Plasmolysis method

Osmometer

Molar concentration of the cell sap

Deplasmolysis

Solution

Question 8

Pure water has minimum $$\psi_w$$.

Pure water has maximum $$\psi_w$$.

Pure water has maximum D.P.D.

Pure water has variable $$\psi_w$$ and DPD.

Solution

Question 9

Root hair

Cortex cell of the root

Passage cell of the root

Mesophyll cell

Solution

Question 10

Salt inhibits reproduction of bacteria.

Enough light is unavailable for photosynthesis.

They become plasmolysed and death occurs.

Nutrients in the pickle medium can not support life.

Solution

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