Transport in Plants Test

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Transport in Plants Test - 19

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Weekly Quiz Competition

Question 1
1 / -0

The initial stage of water absorption by root cells is by

A
Adsorption

B
Absorption

C
Osmosis

D
Imbibition

Solution

The initial stage of water absorption is always imbibition. Imbibition is a process of absorption water by dry surface and causing them to enormously increase in volume. The classical examples of imbibition are the absorption of water by seeds and dry wood.
Question 2
1 / -0

Cells absorb water by

A
Osmosis

B
Osmosis and imbibition

C
Imbibition alone

D
Diffusion
Question 3
1 / -0

Glucose is not stored in plant due to

A
Decrease in osmotic pressure

B
Increase in osmotic pressure

C
Increase in turgor pressure

D
Decrease in turgor pressure

Solution

Glucose is osmotically active and will increase the osmotic pressure inside a cell and this will lead to physiological water imbalance. Hence, glucose is stored as osmotically inactive starch.
Question 4
1 / -0

When osmotic pressure becomes equal to the wall pressure, then

A
The flow of water will be inside the cell.

B
The flow of water will be outside the cell.

C
Both flow will occur inside as well as outside.

D
There will be no flow.

Solution

Diffusion pressure deficit or DPD is responsible for movement of water in a cell. DPD is calculated as the difference between osmotic pressure (OP) and turgor pressure (TP). Usually in a plant cell TP is equal to wall pressure or WP. When OP is equal to WP the calculated value of DPD will be zero and hence, there will not be any flow of water inside or outside the cell.
Question 5
1 / -0

Water is necessary

A
Content of protoplasm

B
Solvent

C
Reagent

D
All of the above

Solution

In living systems water is universal solvent. Water is the major constituent of protoplasm and is also a reagent in a number of biochemical reactions.
Question 6
1 / -0

Identify the correct relationship with reference to water potential of a plant cell.

A
$$\psi _{w}=\psi _{m}+\psi _{s}+\psi _{p}$$

B
$$\psi _{w}=\psi _{m}+(\psi _{s}-\psi _{p})$$

C
$$\psi _{w}=\psi _{m}-(\psi _{s}+\psi _{p})$$

D
$$\psi _{w}=\psi _{m}-\psi _{s}-\psi _{p}$$

Solution

The water potential is calculated by the sum of osmotic or solute potential and pressure potential. The matrix potential is a minor factor in calculation of water potential and can be neglected.
So, the correct answer is '$$\psi _{w}=\psi _{m}+\psi _{s}+\psi _{p}$$'
Question 7
1 / -0

The potential energy of water is referred to as

A
Water potential

B
Osmotic potential

C
Gravity potential

D
Pressure potential

Solution

The potential energy is due to number of molecules of water present in a system. More the number of molecules, more will be the potential energy. The term used to denote this energy is water potential i.e., potential to do work due to water molecules.
Question 8
1 / -0

Water potential $$\Psi $$ measured in bar or in

A
$$Ib/in^{2}$$

B
mm of Hg

C
atm

D
All of the above

Solution

Water potential is expressed in units of pressure and hence, any unit which is used to express pressure can be used for water potential.
Question 9
1 / -0

What will be the effect of accumulation of $$K^{+}$$ ions in guard cells?

A
Water potential increase

B
Water potential decrease

C
Loss of turgidity

D
Exosmosis

Solution

Accumulation of $$K^+$$ ions in guard cells, will decrease water potential. Consequently water will move inside the guard cells from surrounding cells, making them turgid. When the guard cells are turgid, the stomatal pore will open.
So, the correct answer is 'Water potential decrease'
Question 10
1 / -0

What will be the direction of movement of water, when a solution A having water potential of - 9bars and another solution B of - 4bars is separated by a semipermeable membrane?

A
B to A

B
A to B

C
Both direction

D
None of the above

Solution

Water flows from a region of higher water potential to a region of lower water potential. In this case water will flow from cell B, which has a water potential of - 4 bars to cell A, which has a water potential of - 9 bars.

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Re-Attempt Weekly Quiz Competition

Transport in Plants Test - 19

Result

Transport in Plants Test - 19

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SHARING IS CARING

Question 1

Adsorption

Absorption

Osmosis

Imbibition

Solution

Question 2

Osmosis

Osmosis and imbibition

Imbibition alone

Diffusion

Question 3

Decrease in osmotic pressure

Increase in osmotic pressure

Increase in turgor pressure

Decrease in turgor pressure

Solution

Question 4

The flow of water will be inside the cell.

The flow of water will be outside the cell.

Both flow will occur inside as well as outside.

There will be no flow.

Solution

Question 5

Content of protoplasm

Solvent

Reagent

All of the above

Solution

Question 6

$$\psi _{w}=\psi _{m}+\psi _{s}+\psi _{p}$$

$$\psi _{w}=\psi _{m}+(\psi _{s}-\psi _{p})$$

$$\psi _{w}=\psi _{m}-(\psi _{s}+\psi _{p})$$

$$\psi _{w}=\psi _{m}-\psi _{s}-\psi _{p}$$

Solution

Question 7

Water potential

Osmotic potential

Gravity potential

Pressure potential

Solution

Question 8

$$Ib/in^{2}$$

mm of Hg

atm

All of the above

Solution

Question 9

Water potential increase

Water potential decrease

Loss of turgidity

Exosmosis

Solution

Question 10

B to A

A to B

Both direction

None of the above

Solution

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