Transport in Plants Test

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Transport in Plants Test - 84

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Weekly Quiz Competition

Question 1
1 / -0

The common material used in demonstrating plasmolysis in the laboratory is

A
Garden Nasturtium

B
Balsam

C
Banyan

D
Tradescantia

Solution

Plasmolysis is the process of shrinkage or contraction of the protoplasm of a plant cell as a result of loss of water from the cell. Plasmolysis is one of the results of osmosis and occurs very rarely in nature, but it happens in some extreme conditions.
The plasmolysis can be induced in the laboratory by immersing living cell in a strong salt solution or sugar solution to lose water from the cell. Normally, Rheo or Tradescantia plant epidermal cells are used for experiment because they have coloured cell sap which can be clearly visible.
Thus, the correct answer is option (D).
Question 2
1 / -0

Exudation of xylem sap on cutting of a shoot is due to

A
Gutttation

B
Root pressure

C
Transpiration

D
None of the above

Solution

(A) Guttation is the secretion of droplets from the pores of the tree.
(B) When stem base is cut xylem sap releases and it is due to root pressure [It push the xylem sap upward so when we cut stem base the pulling force of root pressure works].
(C) Transpiration is the evaporation of water from the upper surface of the leaves.
So, the correct answer is 'Root pressure'.
Question 3
1 / -0

During absorption of water by roots, the water potential of cell sap is lower than that of

A
Pure water and soil solution

B
Neither pure water nor soil solution

C
Pure water but higher than of soil solution

D
Soil solution but higher than that of pure water

Solution

During absorption, there is a concentration gradient between cell sap and soil solution. At the time of absorption concentration of water in the cell is less than soil solution, so at this time the water potential of cell sap will be lower than that of pure water and soil solution.
So the correct answer is 'Pure water and soil pollution'.
Question 4
1 / -0

When beetroot cylinders are washed and then kept in cold water, the anthocyanins do not come out. This indicates that the plasma membrane is

A
Permeable to anthocyanin

B
Impermeable to anthocyanin

C
Differentially permeable to anthocyanin

D
Dead structure

Solution

Beetroot contains the pigment anthocyanins. It is present in cell vacuole in fruits and flower. It has a protective role in plants against extreme temperatures. When beetroot cylinders are washed and placed inside cold water then there is no leakage of anthocyanins because plasma membrane is impermeable to anthocyanin.
So the correct answer is 'Impermeable to anthocyanin'.
Question 5
1 / -0

Which of the following is not that least convincing in the imbibitional theory of ascent of sap ?

A
The imbibitional force is very high from 100 - 1000 atm.

B
The imbibitional force can raise the water to a height of 200' - 400' i.e. the tallest tree.

C
The movement of water is along the walls of the xylem vessels and through the lumen (activity) of the vessels.

D
The movement of water, no doubt is slow, but to some extent can keep pace with transpiration.

Solution

In the imbibition theory, we can easily consider that ascent of sap in plants occur through xylem vessels and along the walls. In plants for the ascent of sap xylem tissue is present which is divided into four elements. Out of four xylem vessels plays an important role in the conduction via adhesion or imbibition or transpiration-pull.
So the correct answer is 'The movement of water is along the walls of the xylem vessels and through the lumen (activity) of the vessels'.
Question 6
1 / -0

Which one is correct ?

A
$$ \Psi_m = \Psi_p + \Psi_s + \Psi_w $$

B
$$ \Psi_w = \Psi_p + \Psi_s + \Psi_m $$

C
$$ \Psi_p = \Psi_w + \Psi_m + \Psi_s $$

D
$$ \Psi_w = \Psi_w \Psi_p + \Psi_p + \Psi_s $$
Solution
A.Correct option -B
B.Explanation for correct option

Water potential is the potential energy of water in a system, a solution or in a living cell, compared to pure water at atmospheric pressure and the same temperature.
Ψw= Ψp+ Ψs+ Ψm, this equation represents water potential of the plant.
Where Ψp = pressure potential
Ψs = solute potential
Ψm = matric potential
Question 7
1 / -0

Supply of excess fertilizer and watering of a grass lawn causes browning of grass leaves due to

A
Decreased photosynthesis

B
Water-logging of soil

C
Leaching of fertilizer to lower soil strata

D
Osmosis and death of root

Solution

When fertilizers and water are supplied in excess in grass lawn then the soil solution becomes very much concentrated and in this soil solution, the solvent is in the minimum amount. Due to their concentration gradient, osmosis occurs and roots start to emit water as the result of exosmosis. Due to loss of excess water, root cells die and grass leaves become brownish.
So the correct answer is 'Osmosis and death of root'.
Question 8
1 / -0

0.1 M solution of solute (non-electrolyte) will have a water potential of

A
-2.3 bars

B
Zero

C
2.3 bars

D
22.4 bars

Solution

Water potential of pure water is zero. Water potential is less than zero as solute is added to water.
Water potential = -iCRT, where
i = ionization constant
C = Molar concentration
R = Pressure constant, that is 0.0831 litre bar/ mol K
T = Temperature in K, that is 273 K.
In the given problem,C = 0.1 M
Hence, water potential = - 1 x 0.1 x 0.0831 x 273 = -2.3 bars.
Thus, the correct answer is option A.
Question 9
1 / -0

Active and passive transports across cell membrane differ in

A
Passive transport is non-selective

B
Passive transport is along the concentration gradient while active transport is due to metabolic energy

C
Active transport is more rapid

D
Passive transport is confined to anions while active transport in confined to cations.

Solution

Active transport is selective for a particular ion and it allows only those ions to pass through it.
example.sodium /potassium channel,calcium channel.
Passive transport is non-selective it occurs along the concentration gradient so this kind of channel allows to transport of many types of ions across the membrane. No, particularity is there for ions transport.
Question 10
1 / -0

Risk of spoilage is less in salted pickles as it causes

A
Guttation

B
Imbibition

C
Diffusion

D
Plasmolysis

Solution

Plasmolysis is an organical phenomenon of exosmosis when a cell or tissue is kept on a strong hypertonic solution (more salt and less water), shrinkage of the protoplast of a cell from its cell wall occurs and the cell dies. Even bacteria and fungi cannot grow in the hypertonic solution because they also get plasmolysed. Plasmolysis fundamentals are practiced in pickle making and canned foods/fruits.
So, the correct answer is option D.

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Re-Attempt Weekly Quiz Competition

Transport in Plants Test - 84

Result

Transport in Plants Test - 84

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SHARING IS CARING

Question 1

Garden Nasturtium

Balsam

Banyan

Tradescantia

Solution

Question 2

Gutttation

Root pressure

Transpiration

None of the above

Solution

Question 3

Pure water and soil solution

Neither pure water nor soil solution

Pure water but higher than of soil solution

Soil solution but higher than that of pure water

Solution

Question 4

Permeable to anthocyanin

Impermeable to anthocyanin

Differentially permeable to anthocyanin

Dead structure

Solution

Question 5

The imbibitional force is very high from 100 - 1000 atm.

The imbibitional force can raise the water to a height of 200' - 400' i.e. the tallest tree.

The movement of water is along the walls of the xylem vessels and through the lumen (activity) of the vessels.

The movement of water, no doubt is slow, but to some extent can keep pace with transpiration.

Solution

Question 6

$$ \Psi_m = \Psi_p + \Psi_s + \Psi_w $$

$$ \Psi_w = \Psi_p + \Psi_s + \Psi_m $$

$$ \Psi_p = \Psi_w + \Psi_m + \Psi_s $$

$$ \Psi_w = \Psi_w \Psi_p + \Psi_p + \Psi_s $$

Solution

Question 7

Decreased photosynthesis

Water-logging of soil

Leaching of fertilizer to lower soil strata

Osmosis and death of root

Solution

Question 8

-2.3 bars

Zero

2.3 bars

22.4 bars

Solution

Question 9

Passive transport is non-selective

Passive transport is along the concentration gradient while active transport is due to metabolic energy

Active transport is more rapid

Passive transport is confined to anions while active transport in confined to cations.

Solution

Question 10

Guttation

Imbibition

Diffusion

Plasmolysis

Solution

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