Transport in Plants Test

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Transport in Plants Test - 20

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Weekly Quiz Competition

Question 1
1 / -0

Osmotic pressure of a solution is

A
Greater than pure solvent

B
Less than pure solvent

C
Equal to pure solvent

D
Less than or greater than pure solvent

Solution

A solution will be having greater solute particles as compared to pure solvent. Osmotic pressure is dependent of concentration of solute particles. Hence, a solution will always have greater osmotic pressure than pure solvent.
Question 2
1 / -0

Water potential can be obtained by

A
OP + TP

B
OP $$=$$ WP

C
P + $$\pi$$

D
OP - DPD

Solution

Water potential is the algebraic sum of osmotic potential and pressure potential. Here, osmotic potential has a negative sign and pressure potential has a positive sign. Water potential of solution is always negative.
Question 3
1 / -0

The movement of water from one cell of the cortex to the adjacent one in root is due to

A
Accumulation of inorganic salts in the cells

B
Accumulation of organic compounds in the cells

C
Chemical potential gradient

D
Water potential gradient

Solution

Water transport in living systems follows a water potential gradient and water flows from a higher water potential towards a lower water potential. It should be understood that water potential of pure water is zero. Hence, the water potential of all solutions is negative. Water flows from higher to lower water potential means from less negative to more negative value.
Question 4
1 / -0

When the concentration of the solutes in the soil is low, the absorption of water ?

A
Remains normal

B
Will stop

C
Will increase

D
Will decrease

Solution

Water flows from a region of high potential to a region of low potential. If solutes are present in low concentration in the soil it means high water potential in soil and consequently, water absorption by the plants will increase.
Question 5
1 / -0

When a cell is fully turgid, which of the following will be zero?

A
Wall pressure

B
Osmotic pressure

C
Turgor pressure

D
Water potential
Solution
- Water always flows from higher water potential to an area of lower water potential.
- In a fully turgid cell, water potential inside cell will be same as outside the cell and no net movement of water will occur.
- In such a cell osmotic pressure will be equal to turgor pressure and so water potential becomes zero.
So, the correct answer is option D.
Question 6
1 / -0

Bordered pits relating with water uptake are located in

A
Cortex

B
Endodermis

C
Vessel element

D
Tracheary elements

Solution

Pits are present on xylem tracheids, which have tapering end walls. Pits can be simple or bordered. The pits play an important role in the ascent of sap through the tracheids.
So, the correct answer is option D.
Question 7
1 / -0

Cell A has osmotic potential of -18 bars and pressure potential of 8 bars whereas, cell b has osmotic potential of -14bars and pressure potential 2 bars, the direction of flow of water will be

A
From cell B to cell A

B
From cell A to cell B

C
No flow of water

D
In both the direction
Solution
- Water flows from higher water potential to lower water potential. The water potential is calculated by the sum of osmotic potential and pressure potential. Using this formula water potential of cell A comes out to be -10 bars,
- whereas the water potential of cell B comes out to be -12 bars. Hence, water will flow from cell A (higher water potential) to cell B (lower water potential).
Question 8
1 / -0

Apoplastic movement of water in plants occurs on the outer side of

A
Casparian strips

B
Plasma membrane

C
Plasmodesmata

D
None of the above

Solution

Water in plants is absorbed by the roots through the apoplastic and symplastic pathway. In apoplastic movement, water moves from cell to cell through the intercellular spaces or walls of the cells and hence on the outer side of the plasma membrane. Majority of the water in roots is carried by the apoplastic pathway, except at the casparian strip. Thus, the correct answer is option B.
Question 9
1 / -0

Movement of H$$_2$$O through cell wall and intercellular spaces is called

A
Apoplast

B
Symplast

C
Tonoplast

D
None of the above

Solution

The process of movement of water outside the plasma membrane and in the intercellular spaces is called as apoplastic pathway or apoplast.
So, the correct answer is option A.
Question 10
1 / -0

The water potential and osmotic potential of pure water are

A
100 and 0

B
0 and 0

C
100 and 200

D
0 and 100

Solution

Water potential of pure water is zero by convention and osmotic potential of pure water is zero, because there are no dissolved salts. In case some solute particles are there in solution then only some osmotic potential will develop.

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Re-Attempt Weekly Quiz Competition

Transport in Plants Test - 20

Result

Transport in Plants Test - 20

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SHARING IS CARING

Question 1

Greater than pure solvent

Less than pure solvent

Equal to pure solvent

Less than or greater than pure solvent

Solution

Question 2

OP + TP

OP $$=$$ WP

P + $$\pi$$

OP - DPD

Solution

Question 3

Accumulation of inorganic salts in the cells

Accumulation of organic compounds in the cells

Chemical potential gradient

Water potential gradient

Solution

Question 4

Remains normal

Will stop

Will increase

Will decrease

Solution

Question 5

Wall pressure

Osmotic pressure

Turgor pressure

Water potential

Solution

Question 6

Cortex

Endodermis

Vessel element

Tracheary elements

Solution

Question 7

From cell B to cell A

From cell A to cell B

No flow of water

In both the direction

Solution

Question 8

Casparian strips

Plasma membrane

Plasmodesmata

None of the above

Solution

Question 9

Apoplast

Symplast

Tonoplast

None of the above

Solution

Question 10

100 and 0

0 and 0

100 and 200

0 and 100

Solution

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