Transport in Plants Test

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Transport in Plants Test - 29

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Weekly Quiz Competition

Question 1
1 / -0

When a man supplies fertilizer to a plant and then watered it, its leaves turned brown after some time. This is because of

A
Osmosis

B
Plasmolysis

C
Diffusion

D
Deplasmolysis

Solution

In this case, the soil solution is hypertonic as compared to cell sap. The soil solution has become hypertonic, because of the fertilizer added to the soil. Due to the process of exosmosis water is moving out of plant root cells leading to plasmolysis i.e., shrinkage of protoplasm.
So, the correct answer is option B.
Question 2
1 / -0

Osmotic pressure is maximum in

A
Hydrophytes

B
Halophytes

C
Xerophytes

D
Mesophytes

Solution

Halophytes grow in physiologically dry conditions. Here water is available but plants find it difficult to absorb, because of high salt concentration in soil. To overcome this plants maintain a higher osmotic pressure in cell sap, so that they are able to absorb water inspite of high salt concentration in soil.
Question 3
1 / -0

The process by which water is absorbed by solids, like colloids causing them to increase in volume is called as

A
Osmosis

B
Plasmolysis

C
Imbibition

D
Diffusion

E
Facilitated diffusion

Solution

Imbibition is the process of adsorption of water by the solid surface like colloids. It causes an increase in the volume of the colloid. The increase in volume and amount of water adsorbed depends on the nature of colloid or adsorbing matrix and the solvent.
Question 4
1 / -0

In a fully turgid cell, which one of the following is zero?

A
OP

B
TP

C
SP

D
None of the above

Solution

Water enters a cell due to Diffusion Pressure Deficit (DPD) or Suction Pressure (SP). Water always flows from a region of lower DPD to higher DPD. The mathematical relation for determining DPD (or SP) is OP - TP.
When a cell is fully turgid, its OP is equal to TP and DPD or SP is zero. The turgid cell cannot absorb any more water.
Thus, the correct answer is option C.
Question 5
1 / -0

Pathway of water inside plant body after its absorption is by

A
Apoplast

B
Symplast

C
Both A and B

D
None of the above

Solution

Symplast is the living portion of a plant body, whereas apoplast is the non living portion. Apoplast comprises of cell wall and intercellular spaces. Symplast comprises the cell membranes, plasmodesmata and the living protoplasm.
Transportation in a plant body, after absorption, occurs both through apoplast and symplast pathway.
Question 6
1 / -0

Which one of the following is associated with free energy concept of water flux?

A
DPD

B
TP and OP

C
$$\Psi$$

D
None of the above

Solution

The symbol psi denotes water potential. Water potential also describes the chemical potential or free energy of water. More the number of water molecules in the system, more is the free energy content, more is the chemical potential and more is the water potential. Thus, pure water has maximum water potential. The water potential of pure water has been assumed to be zero.
Question 7
1 / -0

The water available to the plant from hollard is called

A
Chresard

B
Echard

C
Gravitational water

D
Hygroscopic water

Solution

Hollard is the total water present in the field. Out of this water, the water available to the plants (usually the capillary water) is called chresard. Echard is the amount of water, which is usually not available to the plants. Whereas gravitational water is the water which has entered the water table under the influence of gravity and hygroscopic water is the water that presents in a thin film around soil particles and is not available to plants. Thus, the correct answer is the option A.
Question 8
1 / -0

Cell A and cell B are adjacent plant cells. In cell A, $$\Psi_s=-20 bars$$ and $$\Psi_p=8 bars$$. In cell B, $$\Psi_s=-12 bars$$ and $$\Psi_p=2 bars$$. Then,

A
Water moves from cell B to cell A

B
Equal amount of water is simultaneously exchanged between cell A and cell B

C
Water moves from cell A to cell B

D
There is no movement of water between cell A and cell B

Solution

Water potential can be calculated by adding solute potential and pressure potential.
The water potential of cell A comes out to be minus twelve bars, while in cell B it comes out to be minus ten bars.
Water flows from a region of higher water potential to a region of lower water potential. Hence, water will flow from cell B to cell A.
Question 9
1 / -0

In the active absorption, movement of water is through

A
Symplast

B
Free spaces

C
Apoplast

D
All of the above

Solution

Active absorption requires input of energy. Energy is available in living tissues only where it is produced by the process of respiration.
Symplast is the living portion of a plant body, whereas apoplast is the non living portion. Hence, active absorption will always occur in symplast and not in apoplast.
So, the correct answer is 'Symplast'
Question 10
1 / -0

The component, $$\Psi_s$$ denotes

A
Pressure potential

B
Gravity potential

C
Solute potential

D
Both A and B

Solution

The symbol psi denotes water potential. Water potential also describes the chemical potential or free energy of water. More the number of water molecules in the system, more is the free energy content, more is the chemical potential and more is the water potential. Thus, pure water has maximum water potential. The water potential of pure water has been assumed to be zero.
For a solution the water potential is calculated by addition of solute potential $$\Psi_s$$, pressure potential $$\Psi_p$$ and matrix potential $$\Psi_m$$.

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Re-Attempt Weekly Quiz Competition

Transport in Plants Test - 29

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Transport in Plants Test - 29

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SHARING IS CARING

Question 1

Osmosis

Plasmolysis

Diffusion

Deplasmolysis

Solution

Question 2

Hydrophytes

Halophytes

Xerophytes

Mesophytes

Solution

Question 3

Osmosis

Plasmolysis

Imbibition

Diffusion

Facilitated diffusion

Solution

Question 4

OP

TP

SP

None of the above

Solution

Question 5

Apoplast

Symplast

Both A and B

None of the above

Solution

Question 6

DPD

TP and OP

$$\Psi$$

None of the above

Solution

Question 7

Chresard

Echard

Gravitational water

Hygroscopic water

Solution

Question 8

Water moves from cell B to cell A

Equal amount of water is simultaneously exchanged between cell A and cell B

Water moves from cell A to cell B

There is no movement of water between cell A and cell B

Solution

Question 9

Symplast

Free spaces

Apoplast

All of the above

Solution

Question 10

Pressure potential

Gravity potential

Solute potential

Both A and B

Solution

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