Transport in Plants Test

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Transport in Plants Test - 50

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Question 1
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Osmosis is

A
Passage of solvent only through a semipermeable membrane.

B
Passage of solutes only through a membrane.

C
Passage of both solvent and solute through a membrane.

D
Passage of solution through a protoplasm.

Solution

Osmosis is the process of movement of molecules from the region of higher concentration to the lower concentration through a semipermeable membrane. The cells absorbs water by the process of endosmosis from its surrounding and water exits by the process of exosmosis. 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 2
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Imbibition involves

A
Diffusion of water

B
Movement of water into imbibant through capillarity

C
Movement of water into imbibant through diffusion as well as capillary action

D
Adsorption of water

Solution

The process of adsorption of water by solid particles of a substance without forming a solution is called imbibition. The soild substance which absorbs water is known as imbibant. Water molecules are at constant random motion because of its less viscosity so it has greater kinetic energy. Due to its kinetic energy, water is adsorbed by the surface from higher concentration to lower concentration by the process of diffusion or capillary action. The kinetic energy is released as heat.
So, the correct answer is option C.
Question 3
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Which one does not involve osmosis ?

A
Water passing from one xylem element to the other above it.

B
Water passing from soil to root hair.

C
Water passing into mesophyll cell from xylem.

D
Water passing from root hair cell to cortical cell.

Solution

Osmosis is the flow of water from high to low concentrations when the concentration gradient is present.
When water moves upwards through xylem elements then it does not involve osmosis. In this case, water moves through transpiration pull and root pressure by active and passive absorption of water.
So the correct answer is 'Water passing from one xylem element to the other above it'.
Question 4
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A slice of sugar beet placed in concentration salt solution would

A
Become swollen

B
Lose water and become flaccid

C
Absorb small quantity of water

D
Show no change

Solution

Concentration salt solution is a hypertonic solution. When slice sugar beet is placed inside the salt solution, it will lose water and hence turgor pressure by plasmolysis decreases to a point where the protoplasm of cell peels away from the cell wall, leaving gaps between the cell wall and the membrane and making the cell flaccid.
So the correct answer is 'Lose water and become flaccid'.
Question 5
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Raisins placed in water swell up due to

A
Plasmolysis

B
Adsorption

C
Diffussion

D
Endosmosis

Solution

When dry raisins are placed in water, it has a low water concentration or is less dilute from the surrounding water. As a result of which water from high concentration travels inside the raisins to low concentration through a semi permeable membrane. This continuous inward movement of water swells up the raisins and is called endosmosis.
Thus, the correct answer is option (D).
Question 6
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Which of the following is appropriate for mass flow hypothesis?

A
Large amount of ions are also absorbed alongwith absorption of water.

B
As suction pressure increases, absorption of water increases and along with water, absorption of ions also increases.

C
Transpiration pull is responsible for absorption of ions.

D
All the above.

Solution

Mass flow hypothesis is also known as the pressure flow hypothesis. It was proposed by Ernst Munch in 1930.
During this process, the large number of ions are absorbed along with the absorption of water. Due to an increase in suction pressure and transpiration pull, absorption of water and ions increases.
So the correct answer is 'All of the above'.
Question 7
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Plant cells kept in hypertonic solution will get

A
Lysed

B
Turgid

C
Deplasmolysed

D
Plasmolysed

Solution

Plant cells kept in hypertonic solution starts 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 D.
Question 8
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During osmosis, water passes through a semipermeable membrane

A
From Low $$ \psi_w $$ to High $$ \psi_w $$

B
From High solute concentration to Low solute concentration

C
From High $$ \psi_w $$ to Low $$ \psi_w $$

D
From Hypotonic solution to Hypertonic solution

Solution

During osmosis, water passes through a semipermeable membrane from hypotonic solution to hypertonic solution. Osmosis involves the movement of molecules from the region of higher concentration of the solvent or lower concentration of solute to the lower concentration of the solvent or higher concentration of solute through a semipermeable membrane.
So, the correct answer is option D.
Question 9
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The principal pathway of water translocation in angiosperms is

A
Sieve cells

B
Sieve tube elements

C
Xylem vessel system

D
Xylem and phloem

Solution

Translocation is the movement of solutes from the leaf to various parts of the body. Sucrose is actively participated from the sources to the sink. As the sucrose moves down from the source the water potential decreases and thus water from the xylem enters the phloem. The movement of water in the xylem is mainly carried by xylem vessels. Xylem vessels are long hollow chains of tough long dead xylem cells. The main function of xylem vessel is to conduct water and minerals from one part to another.
So, the correct answer is option C.
Question 10
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Diffusion of water through selectively permeable membrane is

A
Diffusion

B
Imbibition

C
Osmosis

D
Translocation

Solution

Osmosis is the process of diffusion of molecules from the region of higher concentration to the lower concentration through a semipermeable membrane. The cells absorb water by the process of endosmosis from its surrounding and water exits by the process of exosmosis.
So, the correct answer is option C.

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Transport in Plants Test - 50

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Transport in Plants Test - 50

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SHARING IS CARING

Question 1

Passage of solvent only through a semipermeable membrane.

Passage of solutes only through a membrane.

Passage of both solvent and solute through a membrane.

Passage of solution through a protoplasm.

Solution

Question 2

Diffusion of water

Movement of water into imbibant through capillarity

Movement of water into imbibant through diffusion as well as capillary action

Adsorption of water

Solution

Question 3

Water passing from one xylem element to the other above it.

Water passing from soil to root hair.

Water passing into mesophyll cell from xylem.

Water passing from root hair cell to cortical cell.

Solution

Question 4

Become swollen

Lose water and become flaccid

Absorb small quantity of water

Show no change

Solution

Question 5

Plasmolysis

Adsorption

Diffussion

Endosmosis

Solution

Question 6

Large amount of ions are also absorbed alongwith absorption of water.

As suction pressure increases, absorption of water increases and along with water, absorption of ions also increases.

Transpiration pull is responsible for absorption of ions.

All the above.

Solution

Question 7

Lysed

Turgid

Deplasmolysed

Plasmolysed

Solution

Question 8

From Low $$ \psi_w $$ to High $$ \psi_w $$

From High solute concentration to Low solute concentration

From High $$ \psi_w $$ to Low $$ \psi_w $$

From Hypotonic solution to Hypertonic solution

Solution

Question 9

Sieve cells

Sieve tube elements

Xylem vessel system

Xylem and phloem

Solution

Question 10

Diffusion

Imbibition

Osmosis

Translocation

Solution

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