Transport in Plants Test

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Transport in Plants Test - 79

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Question 1
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Osmosis is the movement of ________________

A
Solute particles from higher concentration to lower concentration

B
Solvent particles from lower solute concentration to the higher solute concentration of solution through a semipermeable membrane

C
Solute particles from higher concentration to lower concentration through a semipermeable membrane

D
Solvent particles from lower water potential to higher water potential

Solution

Osmosis is a movement of solvent particles or water from lower solute concentration to higher solute concentration through the semipermeable membrane. This process does not require energy. This requires a concentration gradient. Therefore, option B is correct.
Question 2
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What is meant by deplasmolysis?

A
Process of returning of plasmolysed cell to its initial stage.

B
Process of returning of plasmolysed cell to more plasmolysed stage.

C
Process of returning of normal cell to its plasmolysed stage.

D
Process of returning of normal cell to its shrink form.

Solution

Plasmolysis is a process in which when a cell is placed in a hypertonic solution, then due to exosmosis, the cell loses water and shrinks. When such cell is placed in water or in the hypotonic solution, then the water molecules enter inside the cell and protoplasm of the cell returns to its initial state with normal turgor. This process is termed as deplasmolysis. Thus, the correct answer is option A.
Question 3
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The given figure represents a plant cell after being placed in a strong sugar solution. The different parts have been labelled as a, b, c, d and e. Which of the following is the correct labelling?

A
a- Cell wall, b- Sugar solution, c- Protoplasm, d- Vacuole, e- Cell membrane

B
a- Cell membrane, b- Sugar solution, c- Protoplasm, d- Vacuole, e- Cell membrane

C
a- Cell wall, b- Sugar solution, c- Vacuole, d- Protoplasm, e- Tonoplast

D
a- Cell membrane, b- Sugar solution, c- Vacuole, d- Protoplasm, e- Tonoplast

Solution

The cell wall is the outermost layer of the plant cell. The Large vacuole is also a characteristic feature of plant cell present at the center of the cell. Plant cells always have a strong cell wall surrounding them.
When plant cells are placed in concentrated sugar solutions they lose water by exosmosis and they become flaccid; this is the exact opposite of turgid and the contents of the cells have shrunk and pulled away from the cell wall: they are said to be plasmolysed. During osmosis, sugar solution is gather at the space between the protoplasm and cell wall. Thus, the correct answer is option A.
Question 4
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Osmosis can be defined as

A
The diffusion of water or solvent through a semipermeable membrane from a solution of a lower concentration of solutes to a solution of a higher concentration of solutes, to which the membrane is relatively impermeable, is called osmosis.

B
The diffusion of water or solvent through an impermeable membrane from a solution of a lower concentration of solutes to a solution of a higher concentration of solutes, to which the membrane is relatively impermeable, is called osmosis.

C
The diffusion of water or solvent through a semipermeable membrane from a solution of a higher concentration of solutes to a solution of a lower concentration of solutes, to which the membrane is relatively impermeable, is called osmosis.

D
None of the above.

Solution

In osmosis, only solvent molecules can move through a semipermeable membrane. In this process, water molecule moves from the region of its higher concentration to the region of its lower concentration. Thus, an osmosis is the diffusion of the water molecule through the semipermeable membrane.
Therefore, option A is correct.
Question 5
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Freshly cut potato chip is put into a strong solution of sugar, later it will be found

A
Flaccid

B
Turgid

C
More full of starch

D
More full of sugar

Solution

Sugar and salt solutions both are the hypertonic solutions and causes exosmosis. If we put the potato chip in a strong salt or sugar solution, it will lose mass because the concentration of sugar surrounding the potato is grater than in the potato. Therefore the water will diffuse out of the potato into the sugar solution, this will make the potato chip flaccid.
Therefore, the correct answer is option A.
Question 6
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Plasmolysis is not observed in boiled plant tissue because

A
The cell wall becomes impermeable to water

B
The cell membrane disintegrates

C
The cell wall disintegrates

D
The cell membrane becomes impermeable to water

Solution

Plasmolysis is a process in which protoplasm loses water, shrinks and cell membrane detaches from the cell wall when a cell is kept in a hypertonic solution. In boiled plant tissue, the cell wall disintegrates. Hence, plasmolysis does nor occur in such tissue.
Question 7
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Latika observed her grandmother adding lots of salt on unripe mangoes to prepare pickles. Her grandmother also added an excess of oil in the pickle jar. What could be the reason for it?

A
Salt prevents the growth of microorganisms by retaining moisture in the food item and oil provides an environment in which microorganisms cannot grow.

B
Salt prevents the growth of microorganisms by forcing them to lose water by osmosis and oil provides an environment in which microorganisms cannot grow.

C
Salt prevents the growth of microorganisms by retaining moisture in the food item and oil prevents their growth by forcing out water from them by osmosis.

D
Salt prevents the growth of microorganisms by forcing them to lose water by osmosis and oil prevents their growth by retaining moisture in the food item.

Solution

Osmosis is also used for preserving fruits and meats, though the process is quite different for the two. In the case of fruit, osmosis is used to dehydrate it, whereas, in the preservation of meat, osmosis draws salt into it, thus preventing the intrusion of bacteria.
Microbes cannot grow in a condition where oil is present. It is because it makes a shield on top of the pickle which prevents aerobic conditions inside the jar. Thus, the correct answer is option B.
Question 8
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Which of the following is true concerning the water potential of a plant cell?

A
It is higher than air.

B
It becomes higher when $$K^+$$ ions are actively moved into the cell.

C
It is equal to zero when the cell is in pure water and turgid.

D
It becomes lower after the uptake of water by osmosis.
Question 9
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Osmosis takes place between two solutions separated by a semipermeable membrane because

A
Water molecules move from more dilute solution to less dilute solution

B
Solute molecules move from less dilute solution to more dilute solution

C
Water molecules move from less dilute solution to more dilute solution

D
Solute molecules move from more dilute solution to less dilute solution

Solution

Osmosis is a passive process, which does not require energy for the movement of a water molecule through the semipermeable membrane. Hence, this movement occurs from higher solvent concentration to lower solvent concentration. In other words, movement occurs from more dilute solution to less dilute solution. Therefore, option A is correct.
Question 10
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Which pressure developed in the root, forces the water into xylem vessel and upwards into the stem for a certain height?

A
Osmotic pressure

B
Root pressure

C
Atmospheric pressure

D
Turgor pressure
Solution
The pressure with which water is pushed into the xylem tubes of the root is called root pressure. The water moving upwards forms a column, which is maintained up to a certain height due to root pressure.
In tall trees, trees, this type of absorption plays a minor role in transporting water. This process is slow, and it cannot make up for the water lost by transpiration (the evaporation of water from the leaves). Transpiration is rapid during the day.
The loss of water due to transpiration creates a suction force that pulls water up through the xylem vessels. This transpiration pull serves as the main force that transports water through the xylem.
Root pressure helps in the transport of water at night.
So, the correct answer is option B.

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Transport in Plants Test - 79

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Transport in Plants Test - 79

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SHARING IS CARING

Question 1

Solute particles from higher concentration to lower concentration

Solvent particles from lower solute concentration to the higher solute concentration of solution through a semipermeable membrane

Solute particles from higher concentration to lower concentration through a semipermeable membrane

Solvent particles from lower water potential to higher water potential

Solution

Question 2

Process of returning of plasmolysed cell to its initial stage.

Process of returning of plasmolysed cell to more plasmolysed stage.

Process of returning of normal cell to its plasmolysed stage.

Process of returning of normal cell to its shrink form.

Solution

Question 3

a- Cell wall, b- Sugar solution, c- Protoplasm, d- Vacuole, e- Cell membrane

a- Cell membrane, b- Sugar solution, c- Protoplasm, d- Vacuole, e- Cell membrane

a- Cell wall, b- Sugar solution, c- Vacuole, d- Protoplasm, e- Tonoplast

a- Cell membrane, b- Sugar solution, c- Vacuole, d- Protoplasm, e- Tonoplast

Solution

Question 4

The diffusion of water or solvent through a semipermeable membrane from a solution of a lower concentration of solutes to a solution of a higher concentration of solutes, to which the membrane is relatively impermeable, is called osmosis.

The diffusion of water or solvent through an impermeable membrane from a solution of a lower concentration of solutes to a solution of a higher concentration of solutes, to which the membrane is relatively impermeable, is called osmosis.

The diffusion of water or solvent through a semipermeable membrane from a solution of a higher concentration of solutes to a solution of a lower concentration of solutes, to which the membrane is relatively impermeable, is called osmosis.

None of the above.

Solution

Question 5

Flaccid

Turgid

More full of starch

More full of sugar

Solution

Question 6

The cell wall becomes impermeable to water

The cell membrane disintegrates

The cell wall disintegrates

The cell membrane becomes impermeable to water

Solution

Question 7

Salt prevents the growth of microorganisms by retaining moisture in the food item and oil provides an environment in which microorganisms cannot grow.

Salt prevents the growth of microorganisms by forcing them to lose water by osmosis and oil provides an environment in which microorganisms cannot grow.

Salt prevents the growth of microorganisms by retaining moisture in the food item and oil prevents their growth by forcing out water from them by osmosis.

Salt prevents the growth of microorganisms by forcing them to lose water by osmosis and oil prevents their growth by retaining moisture in the food item.

Solution

Question 8

It is higher than air.

It becomes higher when $$K^+$$ ions are actively moved into the cell.

It is equal to zero when the cell is in pure water and turgid.

It becomes lower after the uptake of water by osmosis.

Question 9

Water molecules move from more dilute solution to less dilute solution

Solute molecules move from less dilute solution to more dilute solution

Water molecules move from less dilute solution to more dilute solution

Solute molecules move from more dilute solution to less dilute solution

Solution

Question 10

Osmotic pressure

Root pressure

Atmospheric pressure

Turgor pressure

Solution

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