Transport in Plants Test

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Transport in Plants Test - 27

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Weekly Quiz Competition

Question 1
1 / -0

The process of imbibition involves

A
Only diffusion

B
Only capillary action

C
Both A and B

D
None of the above

Solution

Imbibition is the type of diffusion in which water is absorbed by the solid and dry matter like wood. This process shows water movement along the concentration gradient, a capillary action. Thus, the correct answer is option C.
Question 2
1 / -0

The first step in the flux of water into a plant seed is

A
Osmosis

B
Imbibition

C
Absorption

D
Suction

Solution

Imbibition is physical adsorption of water molecules by the solid and dry surface. Seed adsorb water due to imbibition. The imbibition of water is the first step in seed germination.
Thus, the correct answer is option B.
Question 3
1 / -0

The factor that controls entry of water into the cell is

A
O.P.

B
I.P.

C
W.P.

D
T.P.

Solution

The osmotic pressure of a solution is equivalent to the pressure which must be exerted upon it to prevent the flow of solvent into it through the semipermeable membrane. The phenomenon of osmosis important in the absorption of water by plants. Leaves become turgid and expand due to their osmotic pressure.
The pressure that an imbibant (the solid particles which adsorb water or any other liquid) develops when submerged in pure imbibing liquid is called imbibition pressure. It is the initial step in the germination of seeds.
The actual pressure exerted by the protoplasm against the cell wall due to the entry of water into it is called turgor pressure which is always less then osmotic pressure unless the cell is in distilled water. The cell wall is rigid and elastic and it exerts an equal and opposite pressure against the expanding protoplasm This pressure is called wall pressure and is equal and opposite to turgor pressure.
Thus, the correct answer is option A.
Question 4
1 / -0

Which of the following has the highest water potential $$(\Psi)$$?

A
1 M salt solution

B
1 M sugar solution

C
1 M sugar solution with 2.3 bars pressure applied on it

D
Distilled water

Solution

Water potential depends on the number or concentration of water molecules. More the number of water molecules in a system, higher will be the water potential. Hence, pure water has highest water potential. By convention water potential of pure water has been fixed as zero. This means that water potential of any solution will always be negative.
Question 5
1 / -0

If a solution of 0.1 M concentration is separated from water with the help of a semipermeable membrane, it develops an osmotic pressure of 2.3 bars and cause osmosis to occur. This means that osmosis could be stopped by

A
The application of a pressure of 2.3 bars on water side

B
The application of a pressure of 2.3 bars on solution side

C
The application of a pressure 2.3 bars on any side

D
Lowering a pressure of 2.3 bars on the solution side

Solution

As water is entering the solution, we need to apply pressure on the solution to counter balance the entry of water into the solution. This actually happens in a cell, when water enters into the cell. The pressure/ force, which causes entry of water into the cell is not only the osmotic pressure but the difference of osmotic pressure and turgor pressure/ wall pressure, because the turgor pressure/ wall pressure exerts force/ pressure in the direction opposite to the direction of movement of water.
Question 6
1 / -0

Hygroscopic water is not available to plants because

A
$$\Psi$$ is greatly increased

B
DPD is greatly decreased

C
$$\Psi$$ becomes strongly negative

D
$$\Psi$$ is increased and DPD is decreased

Solution

Water potential (denoted by symbol psi) of pure water is maximum and its value is zero. Hence, water potential of all solutions is negative. Water flows from a region of higher water potential to a region of lower water potential, because a region having higher water potential has more number of water molecules as compared to the region having lesser water potential.
The hygroscopic water is present as a thin layer around soil particles, it is very tightly held and cannot be accessed by plant roots. Water potential of hygroscopic water is very high on negative side (i.e., very low water potential), hence this water is inaccessible to plants.
Question 7
1 / -0

When a solute is added to pure water the water potential

A
Becomes negative

B
Is lowered

C
Both A and B

D
Is increased

Solution

Water potential (denoted by symbol psi) of pure water is maximum and its value is zero. Whenever some solute is dissolved in pure water or a solution there is a decrease in water potential. Water potential of all solutions is negative. Water flows from a region of higher water potential to a region of lower water potential, because a region having higher water potential has more number of water molecules as compared to the region having lesser water potential.
Question 8
1 / -0

The potential exerted by insoluble colloids is termed as

A
Osmotic potential

B
Diffusion pressure

C
Matric potential

D
Water potential

Solution

Matric potential is a component of water potential due to the adhesion of water molecules to non-dissolved structures of the system, i.e., the matrix, such as plasma membranes or soil particles.
Question 9
1 / -0

The water potential of pure water is zero. If it is converted into a solution of 0.1 M concentration, the water potential

A
Remains unchanged

B
Is decreased by 0.1%

C
And solute potential is increased by 2.3 bars

D
Decreases by 2.3 bars

Solution

Water potential of pure water at normal pressure and temperature is zero. Water potential is equal to the solute potential of the solution. Water potential is calculated by the formula, water potential = -iCRT
Where i = ionization constant
C = Molar concentration
R = Pressure constant = 0.0831 liter bar/mole K
T = Temperature in degrees Kelvin = 273 $$^o$$C
Thus, water potential of 0.1 M solution is -1 x 0.1 x 0.0831 x 273 = -2.3 bars.
Thus, the correct answer is option D.
Question 10
1 / -0

'Osmosis is flow of solution from higher concentration to solution of lower concentration through semi-permeable membrane'. Which is incorrect in the statement?

A
Exact concentration of solution is not given

B
Character of semi-permeable membrane is not given

C
Flow of solution is not possible through semipermeable membrane

D
All of the above

Solution

Osmosis is defined as the flow of solvent molecules from a region of their higher concentration to a region of their lower concentration across a semipermeable membrane. Osmosis does not explains movement of solute particles or solution.

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Re-Attempt Weekly Quiz Competition

Transport in Plants Test - 27

Result

Transport in Plants Test - 27

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SHARING IS CARING

Question 1

Only diffusion

Only capillary action

Both A and B

None of the above

Solution

Question 2

Osmosis

Imbibition

Absorption

Suction

Solution

Question 3

O.P.

I.P.

W.P.

T.P.

Solution

Question 4

1 M salt solution

1 M sugar solution

1 M sugar solution with 2.3 bars pressure applied on it

Distilled water

Solution

Question 5

The application of a pressure of 2.3 bars on water side

The application of a pressure of 2.3 bars on solution side

The application of a pressure 2.3 bars on any side

Lowering a pressure of 2.3 bars on the solution side

Solution

Question 6

$$\Psi$$ is greatly increased

DPD is greatly decreased

$$\Psi$$ becomes strongly negative

$$\Psi$$ is increased and DPD is decreased

Solution

Question 7

Becomes negative

Is lowered

Both A and B

Is increased

Solution

Question 8

Osmotic potential

Diffusion pressure

Matric potential

Water potential

Solution

Question 9

Remains unchanged

Is decreased by 0.1%

And solute potential is increased by 2.3 bars

Decreases by 2.3 bars

Solution

Question 10

Exact concentration of solution is not given

Character of semi-permeable membrane is not given

Flow of solution is not possible through semipermeable membrane

All of the above

Solution

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