Transport in Plants Test

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Transport in Plants Test - 48

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Question 1
1 / -0

In biological system, the term osmosis involves the diffusion of

A
Water

B
Solutes

C
Energy

D
Both A and B

Solution

Osmosis, in biological system, is the spontaneous movement of solvent molecules (Water molecules) through a semi-permeable membrane from a region of lower solute concentration into a region of higher solute concentration, such that it tends to equalize the solute concentrations on both the sides.
Thus, the correct answer is option (A).
Question 2
1 / -0

Passage of water across a selectively permeable membrane is

A
Active transport

B
Pinocytosis

C
Facilitated diffusion

D
Osmosis

Solution

Active transport is the movement of ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes and requiring energy.
Pinocytosis is a type of endocytosis, where liquid droplets are ingested by living cells.
Facilitated diffusion is the process of spontaneous passive transport of molecules or ions across a cell's membrane via specific transmembrane integral proteins.
Osmosis is a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one.
Thus, the correct answer is option D.
Question 3
1 / -0

Osmotic potential of pure water is

A
One

B
Zero

C
Less than zero

D
Between zero and one

Solution

Osmotic potential is the potential of water molecules to move from a hypotonic solution to a hypertonic solution across a semi permeable membrane. Pure water contains no solutes, thus, it should have zero (0) osmotic potential.
Thus, the correct answer is option (B).
Question 4
1 / -0

Water potential is the sum of opposing forces of

A
Osmotic pressure and diffusion pressure deficit

B
Solute potential and osmotic potential

C
Solute potential and pressure potential

D
Diffusion pressure deficit and turgor pressure

Solution

In general terms, the measure of the ability of water molecules to move freely in solution is called the water potential.
In pure water where there is no solute, all of the water molecules are free to move, so the water potential is high. If a solute is added to the solution, it is attracted to the water molecules, so those water molecules can no longer move freely and the water potential is lower. This is solute potential.
Pressure potential (component of water potential) represents the hydrostatic pressure exerted on water in a cell that limits further water uptake.
Water potential is the sum of solute potential and pressure potential.
Thus, the correct answer is option (C).
Question 5
1 / -0

When chemical fertilisers are given to plants, the soil is to be thoroughly watered otherwise the plants die because of

A
Toxic effects of chemical fertilisers.

B
Plasmolysis due to high concentration of fertilisers.

C
Failure of physiological process like photosynthesis and respiration.

D
None of the above.

Solution

If excess fertilizer is added to the soil then due to a high concentration of chemicals the soil will become hypertonic as compared to the cell sap of the roots of the plant. Thus, the water will flow out of the roots through the process of exosmosis. The roots will become plasmolysed and excessive loss of water may kill the plants. If the soil is thoroughly watered then the concentration of solvent will also become equal to the concentration of solute and there will not be concentration gradient for osmosis and plant will not get killed.
So the correct answer is 'Plasmolysis due to the high concentration of fertilisers'.
Question 6
1 / -0

Dry seeds when placed in water swell up due to

A
Imbibition

B
Absorption

C
Diffusion

D
Adsorption

Solution

Dry seeds when placed in water swell up due to imbibition. The process of adsorption of water by solid particles of a substance without forming a solution is called imbibition. The water potential gradient between the absorbent (seeds) and the liquid imbibed (water) is essential for imbibition.
Water plays an important in germination. It enters inside the seed by the process of imbibition. Water allows the seed to swell which breaks the seed coat and the seed germinate. Factors like temperature, oxygen etc. are required for germination.
So, the correct answer is option A.
Question 7
1 / -0

Imbibitional theory was given by

A
Sachs

B
Boehm

C
Scholander

D
Curtis

Solution

Imbibitional theory was given by Unger and supported by Sachs in 1879. The theory supported the fact that water moves up from the root hair through the xylem by the imbibition of water. Imbibed (absorbed) water moves in tubes in the walls of the plants without the cooperation of living cells and not within the cell cavities.
So, the correct answer is option A.
Question 8
1 / -0

Consider the statements regarding facilitated transport
(1) Requires ATP energy
(2) Transport saturates
(3) Highly selective
(4) Requires special membrane properties
(5) Uphill transport
Of the above statements

A
1, 2, 3 are relevant, 4 and 5 are irrelevant

B
2, 3, 5 are relevant, 1 and 4 are irrelevant

C
2, 3, 4 are relevant, 1 and 5 are irrelevant

D
3, 4, 5 are relevant, 1 and 2 are irrelevant

E
1, 4 and 5 are relevant, 2 and 3 are irrelevant.
Question 9
1 / -0

ATP is required for

A
Active process

B
Passive process

C
All types of processes

D
None of the above.
Question 10
1 / -0

A living continuum of cells connected by plasmodesmata is

A
Dermal tissue

B
Ground complex

C
Donnan free space

D
Symplast

Solution

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.
Symplast absorption is a type of absorption where the water moves through the cytoplasmic connection between the two cell known as plasmodesmata.
So, the correct answer is option D.

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Re-Attempt Weekly Quiz Competition

Transport in Plants Test - 48

Result

Transport in Plants Test - 48

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SHARING IS CARING

Question 1

Water

Solutes

Energy

Both A and B

Solution

Question 2

Active transport

Pinocytosis

Facilitated diffusion

Osmosis

Solution

Question 3

One

Zero

Less than zero

Between zero and one

Solution

Question 4

Osmotic pressure and diffusion pressure deficit

Solute potential and osmotic potential

Solute potential and pressure potential

Diffusion pressure deficit and turgor pressure

Solution

Question 5

Toxic effects of chemical fertilisers.

Plasmolysis due to high concentration of fertilisers.

Failure of physiological process like photosynthesis and respiration.

None of the above.

Solution

Question 6

Imbibition

Absorption

Diffusion

Adsorption

Solution

Question 7

Sachs

Boehm

Scholander

Curtis

Solution

Question 8

1, 2, 3 are relevant, 4 and 5 are irrelevant

2, 3, 5 are relevant, 1 and 4 are irrelevant

2, 3, 4 are relevant, 1 and 5 are irrelevant

3, 4, 5 are relevant, 1 and 2 are irrelevant

1, 4 and 5 are relevant, 2 and 3 are irrelevant.

Question 9

Active process

Passive process

All types of processes

None of the above.

Question 10

Dermal tissue

Ground complex

Donnan free space

Symplast

Solution

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