Transport in Plants Test

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Transport in Plants Test - 57

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is not significant in osmosis?

A
Gravitational potential

B
Concentration gradient

C
Solute potential

D
Pressure potential

Solution

Concentration gradient decides the direction in which water flows through osmosis.
Osmosis also depends on water potential which has two key components that are solute potential and pressure potential. Gravitational potential is ignored while calculating water potential. This is because gravitational potential has such a small value that it doesn't have any significant contribution towards osmosis.
So the correct answer is 'Gravitational potential'.
Question 2
1 / -0

Pressure potential in a plasmolysed cell is

A
Positive

B
Zero

C
Negative

D
Remains same

Solution

Pressure potential is the hydrostatic pressure exerted on water in a cell. When a cell is kept in a hyptonic solution, the plant cell becomes turgid. In this, the pressure potential is a positive value. When a cell a kept in a hypertonic solution, the plant cell becomes plasmolysed. In this, the pressure potential is negative.
Thus, the correct answer is option C.
Question 3
1 / -0

Imbibition involves

A
Solute potential

B
Gravity potential

C
Matric potential

D
Pressure potential

Solution

Imbibition involves matric potential. The process of absorption of water by hydrophilic solid particles of a substance without forming a solution is called imbibition. It is a special type of diffusion, as water moves along its concentration gradient. Therefore, the water absorbed by solid substances or colloids results in an enormous increase in their volume. Matrix potential is the reduction in free energy of water due to the formation of thin immobile surface layers of water molecules over colloidal particles. In case of mature cells and hydrated cell wall, the effect of matrix potential is negligible. Matrix potential is represented by $$\psi_m$$.
Question 4
1 / -0

Apoplastic movement of water occurs exclusively through the
(i) Intercellular spaces
(ii) Walls of the cells
(iii) Plasmodesmata
(iv) Cytoplasm

A
i, ii and iv

B
iii and iv

C
i and ii

D
ii and iv

E
iv

Solution

Apoplast absorption is a type of absorption where the water moves through the cell wall and intercellular spaces between the two cell. Water is absorbed by the root hair from the soil. It passes the epidermis, cortex, endodermis, casparian strip and pericycle and xylem. After reaching the xylem it is pulled up by the transpirational pull.
So, the correct answer is option C.
Question 5
1 / -0

In the given diagram, which is the initial condition of plasmolysis :

A
P

B
Q

C
R

D
S

Solution

In the initial condition of plasmolysis the cell loses water and just loses its turgidity. The shape doesn't change much just the cell membrane stops touching the cell wall. Image Q represents this stage.
Image P represents a turgid cell. Image R and S are the middle and final stages of plasmolysis.
So the correct answer is 'Q'.
Question 6
1 / -0

Which of the following is not correct with respect to mass flow hypothesis?

A
Loading of phloem sets up a water potential gradient that facilitates the mass movement in phloem.

B
The sugar which is transported in phloem sieve.

C
The sugar is moved bidirectionally

D
As hydrostatic pressure in phloem sieve tube increases, pressure flow stops and sap accumulates in phloem.

Solution

According to the mass flow hypothesis, the loading of phloem or accumulation of sugars sets up a water potential which causes the water from nearby xylem cells to enter the phloem tissue and a turgor pressure is developed which causes mass movement.
The flow of sugar is through sieve tubes and the flow is many a time bidirectional.
Due to hydrostatic pressure, pressure flow increases and the phloem sap starts moving.
So the correct answer is 'As hydrostatic pressure in phloem sieve tubes increases, pressure flow stops and sap accumulates in phloem'.
Question 7
1 / -0

Water potential gradient between the absorbent and the liquid imbibed is essential for imbibition. In addition, for any substance to imbibe any liquid, one of the following is also a pre-requisite

A
Affinity between adsorbent and the liquid.

B
Molecular density of adsorbent.

C
Concentration of adsorbent

D
Pressure potential of the absorbant

Solution

Three necessary conditions for imbibition are:
1. A water potential gradient should exist between the adsorbent and liquid.
2. The adsorbent and liquid should have an affinity for each other.
3. Increase in temperature causes the imbibition rate to increase.
Molecular density, concentration, pressure potential do not affect the rates of imbibition.
So the correct answer is 'Affinity between the adsorbent and the liquid'.
Question 8
1 / -0

Incipent plasmolysis is

A
Last stage of plasmolysis

B
Mid stage of plasmolysis

C
Zero hour for inception of plasmolysis

D
Initial stage of plasmolysis

Solution

Incipient plasmolysis is the initial stage of plasmolysis.
During this stage, the cell starts losing water as a consequence of being placed in a hypertonic solution. The protoplast is just about to pull itself away from the cell wall before the cell shrinks.
So the correct answer is 'Initial stage of plasmolysis'.
Question 9
1 / -0

Find out the correct pair of statements :
(i) In completely plasmolysed cell, pressure potential does not contribute to water potential.
(ii) If a cell is placed in hypotonic solution for longer time, the cell membrane shrinks away from its cell wall.
(iii) Apoplastic system comprises inter-connected protoplasts.
(iv) Polypeptides have more imbibing capacity than polysaccharides.

A
i, iv

B
i, ii

C
ii, iv

D
iii, iv

Solution

Due to the absence of turgor pressure, the pressure potential in a plasmolysed cell is zero.
If a cell is kept in a hypotonic solution it will absorb water and swell. It does not shrink. Shrinking happens if it is placed in a hypertonic solution.
Apoplastic system occurs when the water cannot enter the protoplast. The water only passed through the cell wall and intercellular spaces.
Polypeptides being much more hydrophilic in nature as compared to polysaccharide is the reason why polypeptides imbibe more water leading to a greater imbibing capacity compared to polysaccharides.
So the correct answer is 'i, iv'.
Question 10
1 / -0

Water potential of pure water at standard temperature is equal to

A
10

B
20

C
0

D
None of the above

Solution

The free energy of water is referred to as water potential. Water potential is also defined as chemical potential of water. The greater the concentration of water in a system, the greater is its kinetic energy or water potential. Water potential of the soil is quantised in terms of pressure. By convention, the water potential of pure water at standard temperature, which is not under any pressure, is taken to be zero. If some solute is dissolved in pure water, the solution has less free water molecules and the concentration of water decrease, reducing water potential.
So, the correct answer is option C.

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Re-Attempt Weekly Quiz Competition

Transport in Plants Test - 57

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Transport in Plants Test - 57

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SHARING IS CARING

Question 1

Gravitational potential

Concentration gradient

Solute potential

Pressure potential

Solution

Question 2

Positive

Zero

Negative

Remains same

Solution

Question 3

Solute potential

Gravity potential

Matric potential

Pressure potential

Solution

Question 4

i, ii and iv

iii and iv

i and ii

ii and iv

iv

Solution

Question 5

P

Q

R

S

Solution

Question 6

Loading of phloem sets up a water potential gradient that facilitates the mass movement in phloem.

The sugar which is transported in phloem sieve.

The sugar is moved bidirectionally

As hydrostatic pressure in phloem sieve tube increases, pressure flow stops and sap accumulates in phloem.

Solution

Question 7

Affinity between adsorbent and the liquid.

Molecular density of adsorbent.

Concentration of adsorbent

Pressure potential of the absorbant

Solution

Question 8

Last stage of plasmolysis

Mid stage of plasmolysis

Zero hour for inception of plasmolysis

Initial stage of plasmolysis

Solution

Question 9

i, iv

i, ii

ii, iv

iii, iv

Solution

Question 10

10

20

0

None of the above

Solution

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