Transport in Plants Test

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Transport in Plants Test - 18

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Question 1
1 / -0

Osmosis is helpful to plant because

A
Growth of the young cells is brought about by osmotic pressure and turgor pressure of these cells.

B
Certain turgor movements in plant are determined by osmosis.

C
Both A and B.

D
None of the above.

Solution

Osmosis is the process of movement of solvent molecules from the region of higher concentration to the lower concentration. The cells absorb water by the process of osmosis from its surrounding. 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.
The water pressure inside plant cells is called turgor pressure, and it is maintained by a process called osmosis. It also regulates the turgor movement by creating pressure gradients. Example, opening and closing of stomata, drooping of leaves by touch -me -not plant etc
So, the correct answer is option C.
Question 2
1 / -0

A plasmolysed cell can be deplasmolysed by placing it in

A
Isotonic solution

B
Hypertonic solution

C
Saturated solution

D
Pure water or hypotonic solution

Solution

When a plasmolyzed cell is kept in pure water or hypotonic medium, the cell will uptake water due to the process of endosmosis. This water uptake will increase turgor inside the cell and cell will become deplasmolysed.
Question 3
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When water rises from the rhizoids of Riccia to its assimilatory filaments, it is through

A
Osmosis

B
Root pressure

C
Capillary

D
Transpiration pull
Solution
- Riccia is a bryophyte. The bryophytes are small plants, that remain close to the surface of earth. This is because they do not have vascular tissue. Absence of well developed vascular tissue means that water cannot be lifted to great heights. The transpiration pull, capillary and root pressure are the forces important in plants, which have a well developed vascular system like gymnosperms and angiosperms.
- In Riccia cells, rhizoids are living and not free-lumen hollow tubes like xylem vessels or tracheids of higher plants. Hence, capillary action is ruled out. Also when roots are absent, root pressure is out of question. Finally, transpiration pull is also ruled out, because these small plants cannot sustain transpiration. If substantial transpiration occurs the plants itself will get dried up and dessicated and die.
Question 4
1 / -0

A professor kept some moist seeds in an airtight jar and started lecturing. At the end of the experiment, an explosion occurred in the jar. What did the professor want to explain?

A
Osmosis

B
Diffusion

C
Anaerobic respiration

D
Imbibition

Solution

Imbibition is the process of absorption of water by the dry surface, in which there is an increase in the volume of the seeds. The increase in volume generates an imbibitional pressure, which is responsible for the explosion of the jar in this case.
Question 5
1 / -0

Addition of solute in the cell develops

A
TP

B
OP

C
DP

D
WP

Solution

Osmotic pressure develops due to addition of solutes in a solvent. More the concentration of solutes in a solution, greater will be the osmotic pressure developed.
Question 6
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Which one of the following statement(s) is / are wrong?

A
Water potential is the chemical potential of the water.

B
Solutes potential is always negative.

C
Water potential equals solute potential in a fully turgid cell.

D
Pressure potential is negative in a plasmolysed cell.

Solution

Water potential is the difference between the free energy of water molecules in pure water and the energy of water in solution. The presence of a solute in water reduces the free energy and water potential decreases (negative). Plant cell exerts a pressure on the cellular contents called pressure potential. It is usually positive. In plasmolysed cell, it is negative.
Thus, the correct option is C.
Question 7
1 / -0

In the process of osmosis

A
Both protoplasm and cell wall act as a single layer

B
Only protoplast acts as a single layer

C
Only cell membrane acts as a single layer

D
None of the above

Solution

In the process of osmosis cell membrane acts as a semi permeable membrane, through which movement of water takes place along the concentration gradient.
So, the correct answer is 'Only cell membrane acts as a single layer'
Question 8
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In the process of osmosis, the volume of solvent inside the cell .......... than/as outside the cell.

A
Increases

B
Decreases

C
Remain same

D
Volume is not related in osmosis

Solution

Osmosis describes movement of water only. So the net volume of solvent inside the cell and outside the cell before osmosis occurs and the net volume of solvent inside the cell and outside the cell after osmosis occurs will be the same.
Question 9
1 / -0

Wheat grains/gram before germination absorb water by

A
Endosmosis

B
Exosmosis

C
Plasmolysis

D
Imbibition

Solution

Imbibition is the first process in seed germination. It is a physical process in which water is absorbed by seeds. In the presence of water, all the biochemical reaction occurs and thus seeds undergo germination.
So, the correct answer is 'Imbibition'
Question 10
1 / -0

Two cells A and B are contiguous. Cell A has osmotic pressure 10 atm, turgor pressure 7atm and diffusion pressure deficit 3 atm. Cell B has osmotic pressure 8 atm, turgor pressure 3 atm and diffusion pressure deficit 5 atm. The result will be

A
Movement of water from cell B to A

B
No movement of water

C
Equilibrium between the two

D
Movement of water from cell A to B
Solution
- Water flows from lower DPD to higher DPD. Here the DPD of two cells A and B are 3 and 5 atmosphere respectively.
Hence, water will move from cell A to B.

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Re-Attempt Weekly Quiz Competition

Transport in Plants Test - 18

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Transport in Plants Test - 18

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SHARING IS CARING

Question 1

Growth of the young cells is brought about by osmotic pressure and turgor pressure of these cells.

Certain turgor movements in plant are determined by osmosis.

Both A and B.

None of the above.

Solution

Question 2

Isotonic solution

Hypertonic solution

Saturated solution

Pure water or hypotonic solution

Solution

Question 3

Osmosis

Root pressure

Capillary

Transpiration pull

Solution

Question 4

Osmosis

Diffusion

Anaerobic respiration

Imbibition

Solution

Question 5

TP

OP

DP

WP

Solution

Question 6

Water potential is the chemical potential of the water.

Solutes potential is always negative.

Water potential equals solute potential in a fully turgid cell.

Pressure potential is negative in a plasmolysed cell.

Solution

Question 7

Both protoplasm and cell wall act as a single layer

Only protoplast acts as a single layer

Only cell membrane acts as a single layer

None of the above

Solution

Question 8

Increases

Decreases

Remain same

Volume is not related in osmosis

Solution

Question 9

Endosmosis

Exosmosis

Plasmolysis

Imbibition

Solution

Question 10

Movement of water from cell B to A

No movement of water

Equilibrium between the two

Movement of water from cell A to B

Solution

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