Transport in Plants Test

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Transport in Plants Test - 14

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Question 1
1 / -0

Adding solute to pure water will cause development of

A
Positive water potential

B
More positive water potential

C
More negative water potential

D
Negative water potential

Solution

Water potential of pure water is zero. Adding solute to pure water will lead to increase the solute potential and further leads to the development of negative water potential because the number of water molecules decreases and the dissolved solute lowers the free energy of water. Water potential is sum of solute potential and pressure potential. Solute potential is a negative value and pressure potential is a positive value.
So, the correct answer is option D.
Question 2
1 / -0

In plasmolysis, a plant cell

A
Swells up

B
Bursts

C
Becomes flaccid

D
Becomes turgid

Solution

Plasmolysis is the shrinking of the protoplasm as a result of water loss from osmosis when a cell comes in contact with a hypertonic solution. Plant cells kept in hypertonic solution will start losing water by the process of exosmosis as there is lesser concentration of solvent molecules than the fluid inside the cell so the solvent molecules are forced outside the cell from the region of higher concentration to the lower concentration. The cell turns flaccid. On further loss of water, the protoplasm shrinks and moves away from the cell wall and the cell gets plasmolysed.
So, the correct answer is option C.
Question 3
1 / -0

Swelling of wooden frames during rains is caused by

A
Endomosis

B
Imbibition

C
Capillarity

D
Osmosis

Solution

Swelling of wooden frames during rains is caused by the process of 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 ( wooden frame) and the liquid imbibed (water) is essential for imbibition.
So, the correct answer is option B.
Question 4
1 / -0

Osmosis is defined as

A
Flow of solvent (water) through a semipermeable membrane from less concentration solution to more concentrated solution.

B
Flow of solute from a semipermeable membrane.

C
Flow of water without a membrane.

D
None of the above

Solution

Osmosis is the process of movement of molecules from the region of higher concentration of solvent or lower concentration of solute to the lower concentration of solvent or higher concentration of solute through a semipermeable membrane. On absorption of water the turgor pressure inside the cells increases. It helps to maintain the shape of the cell. It helps in the growth, development, mechanical support and prevents wilting.
So, the correct answer is option A.
Question 5
1 / -0

Water potential of a solution is depicted by

A
$$ \psi_p $$

B
$$ \psi_w $$

C
$$ \psi_x $$

D
$$ \triangle \psi $$

Solution

Water potential of a cell is the measure of the tendency of water to move inside or outside of the cell. It is represented by $$ \psi_w $$.
So, the correct answer is '$$ \psi_w $$'.
Question 6
1 / -0

Which of these is not the goal of transpiration?

A
Prevention of loss of water

B
Helping in the absorption and transportation process

C
Supplying water for photosynthesis

D
Keeping the plant cool

Solution

Transpiration helps in the absorption of carbon dioxide gas from the atmosphere and its transportation.
It also helps in maintaining the temperature of the plant by releasing water which gets evaporated taking away the heat of the plant.
Transpiration leads to water loss so it cannot prevent loss of water.
So the correct answer is 'Prevention of loss of water'.
Question 7
1 / -0

Osmosis involves

A
Diffusion of suspended particles from higher to lower concentration.

B
Diffusion of suspended particles from lower to higher concentration.

C
Diffusion of water from more to less concentrated side.

D
Diffusion of water from less to more concentrated side.

Solution

Osmosis is the process of movement of molecules from the region of higher concentration of solvent or lower concentration of solute to the lower concentration of solvent or higher concentration of solute through a semipermeable membrane. On absorption of water the turgor pressure inside the cells increases. It helps to maintain the shape of the cell. It helps in the growth, development, mechanical support and prevents wilting.
So, the correct answer is option D.
Question 8
1 / -0

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

A
Plasmolysis

B
Diffusion

C
Osmosis

D
Imbibition

Solution

a) Plasmolysis is the shrinking of the protoplasm as a result of water loss from osmosis when a cell comes in contact with a hypertonic solution.
b) Diffusion is random movement of molecules from the region of higher concentration to the lower concentration. It allows the gaseous exchange during transpiration from the stomata.
c) Osmosis is the process of movement of molecules from the region of higher concentration of solvent or lower concentration of solute to the lower concentration of solvent or higher concentration of solute through a semipermeable membrane.
d) 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 and the liquid imbibed is essential for imbibition. The absorption takes place mainly due to adsorption and capillary action. The surface which absorbs the water is generally hydrophilic. It increases the volume of imbibants.
So, the correct answer is option D.
Question 9
1 / -0

During phloem transportation sugar is moved in form of sucrose in to the companion cells and them into the living phloem sieve tube cells by -

A
Passive transport

B
Active transport

C
Facilitated diffusion

D
Osmosis

Solution

Pholem is the food-conducting tissue.
The sugar sucrose is transported from the companion cells to the sieve tube by the mechanism for simple diffusion because of the concentration gradient.
The concentration of the sucrose is higher in the companion cells an lower in sieve tubes.
So, the correct option is 'Passive transport'
Question 10
1 / -0

In root apoplast path of water transport; the water is transported through

A
Cell wall only

B
Cell wall and inter cellular spaces

C
Intercellular spaces

D
Intercellular spaces, cell walls and endodermis.

Solution

The water transport in the apoplastic pathway is through the cell membrane and the intercellular spaces. Water and solutes can pass freely through them.
This happens when water cannot enter the cells due to the presence of Caspian strips.
So the correct answer is ' Cell wall and intercellular spaces'.

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Re-Attempt Weekly Quiz Competition

Transport in Plants Test - 14

Result

Transport in Plants Test - 14

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SHARING IS CARING

Question 1

Positive water potential

More positive water potential

More negative water potential

Negative water potential

Solution

Question 2

Swells up

Bursts

Becomes flaccid

Becomes turgid

Solution

Question 3

Endomosis

Imbibition

Capillarity

Osmosis

Solution

Question 4

Flow of solvent (water) through a semipermeable membrane from less concentration solution to more concentrated solution.

Flow of solute from a semipermeable membrane.

Flow of water without a membrane.

None of the above

Solution

Question 5

$$ \psi_p $$

$$ \psi_w $$

$$ \psi_x $$

$$ \triangle \psi $$

Solution

Question 6

Prevention of loss of water

Helping in the absorption and transportation process

Supplying water for photosynthesis

Keeping the plant cool

Solution

Question 7

Diffusion of suspended particles from higher to lower concentration.

Diffusion of suspended particles from lower to higher concentration.

Diffusion of water from more to less concentrated side.

Diffusion of water from less to more concentrated side.

Solution

Question 8

Plasmolysis

Diffusion

Osmosis

Imbibition

Solution

Question 9

Passive transport

Active transport

Facilitated diffusion

Osmosis

Solution

Question 10

Cell wall only

Cell wall and inter cellular spaces

Intercellular spaces

Intercellular spaces, cell walls and endodermis.

Solution

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