Transport in Plants Test

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Transport in Plants Test - 78

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Question 1
1 / -0

Water enters into the root hair from the soil by

A
Diffusion

B
Active transport

C
Reverse osmosis

D
Osmosis

Solution

Diffusion is a process by which molecules intermingle as a result, of their kinetic energy of random motion. It is free movement of a substance from a region of higher concentration to lower concentration. For example, dissolving a coloured dye in water.
Active transport is a transport of substance against the concentration gradient using energy/ATP.
Reverse osmosis uses a method in which pressure is applied to overcome osmotic pressure. The semipermeable membrane is used in this process.
Osmosis is a process in which water molecules diffuse through a semipermeable membrane from more dilute solution to less dilute solution. Root hairs are highly osmotic than soil. So, water easily enters in the roots.
Question 2
1 / -0

Take four peeled potato halves and scoop each one out to make potato cups. One of these potato cups should be made from a boiled potato. Put each potato cup in a trough containing water.

(a) Keep cup A as empty.
(b) Put one teaspoon sugar in cup B.
(c) Put one teaspoon salt in cup C.
(d) Put one teaspoon sugar in the boiled potato cup D.
Keep these for two hours. Then observe the four potato cups and answer the following.

Explain why water gathers in the hollowed portion of B and C.

A
There is the difference in the concentration of water in the through and water in the cup (Potato).

B
Exosmosis takes place as the potato cells act as a semipermeable membrane.

C
Both A and B.

D
None of these

Solution

Sugar and salt solutions both are hypertonic which causes exosmosis and thus water moves from the cell of lower solute concentration to the outside of the cell of higher solute concentration through the semipermeable membrane of potato and gathered in the hollowed portion and potato lining will shrink.
Therefore, the correct answer is option C.
Question 3
1 / -0

Osmosis is defined as the movement of solvent particles through__________

A
Permeable membrane

B
Semi-permeable membrane

C
Membrane

D
None of these

Solution

Osmosis is a process in which the solvent molecules move from the region of higher solvent concentration to the region of lower solvent concentration through a semi-permeable membrane. A semi-permeable membrane allows only solvent molecules to pass through it. It is a passive transport as it does not require energy for movement.
Question 4
1 / -0

Animal cells do not show plasmolysis because

A
They do not exhibit osmosis.

B
They do not possess cell wall.

C
They are living cells.

D
They have intercellular spaces.

Solution

Plant cell possess cell wall, while animal cells lacks it. Plasmolysis occurs, when a cell is kept in hypertonic solution (solution with higher solute concentration). During this process, cell loses water and cell membrane detaches from cell wall. Plant cell shows plasmolysis but animal cell does not show plasmolysis, because, animal cells lack cell wall.
Question 5
1 / -0

Take four peeled potato halves and scoop each one out to make potato cups. One of these potato cups should be made from a boiled potato. Put each potato cup in a trough containing water.

(a) Keep cup A as empty.
(b) Put one teaspoon sugar in cup B.
(c) Put one teaspoon salt in cup C.
(d) Put one teaspoon sugar in the boiled potato cup D.
Keep these for two hours. Then observe the four potato cups and answer the following.

Explain why water does not gather in the hollowed out portions of A and D.

A
In A no concentration gradient occurs, in D no semipermeable membrane present

B
In A no semipermeable membrane, in D no concentration gradient

C
Both A and B

D
None of these

Solution

Cup of potato A is empty and act as a control. Hence, there is no concentration gradient.
Potato D loses its semipermeability due to boiling. Osmosis is a process in which the water molecules move from lower solute concentration to higher solute concentration through a "semipermeable membrane". Thus, the correct answer is option A.
Question 6
1 / -0

Normally, in the process of osmosis, the net flow of water molecules in or out of the cell depends upon differences in the

A
Concentration of water molecules inside and outside the cell

B
Concentration of enzymes on either side of the cell membrane

C
Rate of molecular motion on either side of the cell membrane

D
Rate of movement of insoluble molecules inside the cell

Solution

Osmosis is the diffusion of the solvent through a semi-permeable membrane from a solution of a higher concentration of solvent to a solution of a lower concentration of solvent. It is passive transport and thus it does not require energy but depends on the concentration of a water molecule.
Question 7
1 / -0

Transpiration is a non-enzymatic process. Its $$Q_{10}$$ value is

A
1

B
2

C
3.5

D
0

Solution

Transpiration is a physical process which occurs under the influence of transpiration pull. It leads to the ascent of sap in nonliving xylem cells. $$Q_{10}$$ is the ratio of the rate of the same process at two different temperatures ten degrees apart. For a purely physical process, the value of $$Q_{10}$$ is two. For most biological systems, the $$Q_{10}$$ value is ~ 2 to 3. Thus, the rate of transpiration doubles with every ten-degree rise in temperature.
So, the correct answer is '2'
Question 8
1 / -0

Take four peeled potato halves and scoop each one out to make potato cups. One of these potato cups should be made from a boiled potato. Put each potato cup in a trough containing water.

(a) Keep cup A as empty.
(b) Put one teaspoon sugar in cup B.
(c) Put one teaspoon salt in cup C.
(d) Put one teaspoon sugar in the boiled potato cup D.
Keep these for two hours. Then observe the four potato cups and answer the following.

Why is potato A necessary for this experiment?

A
It acts as a control.

B
It acts as a accessory.

C
Both A and B

D
None of these

Solution

Sugar and salt solutions both are hypertonic which causes exosmosis and thus, water moves from the cell of lower solute concentration to the outside of the cell of higher solute concentration through the semipermeable membrane of potato and gathered in the hollowed portion and potato lining will shrink. But on boiling potato has lost its semipermeable membrane and thus it will not show any changes.
Therefore, one control without water is necessary to show that only osmosis is involved in these changes.
Question 9
1 / -0

Plasmolysis in a plant cell is defined as

A
Breakdown (lysis) of plasma membrane in hypotonic medium

B
Shrinkge of protoplasm in hypertonic medium

C
Shrinkage of nucleoplasm

D
None of the above

Solution

Correct option - B
Explanation for correct option -
The process of shrinkage of protoplasm in hypertonic solution is termed plasmolysis. Plasmolysis is the result of osmosis and occurs rarely in extreme conditions. It is a reversible process.
Question 10
1 / -0

Find out the incorrect statement.

A
Osmosis is a slow process, occurs down the concentration gradient and does not expend energy.

B
Electron microscope uses very high voltage electricity. It uses electromagnets instead of glass lenses and a beam of electrons instead of light.

C
The semipermeable membrane does not allow both solvent and solute molecules to pass through it.

D
Active transport of materials is rapid and usually, occurs against the concentration gradient involving carrier proteins and energy in the form of ATP.
Solution
Osmosis is a process in which the water molecules move from higher solvent concentration to lower solvent concentration through a semipermeable membrane. This process does not require energy.
The electron microscope uses very high voltage electricity. It uses electromagnets instead of glass lenses and a beam of electrons instead of light. Hence, gives better, clear image than a light microscope.
Active transport of materials is rapid and usually occurs against the concentration gradient, i.e., from low to high concentration. It involves carrier proteins and energy in the form of ATP.
A semipermeable membrane is a selectively permeable membrane, it allows the passing of specific solutes and solvents through it.
Thus, the correct answer is option C.

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Transport in Plants Test - 78

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Transport in Plants Test - 78

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SHARING IS CARING

Question 1

Diffusion

Active transport

Reverse osmosis

Osmosis

Solution

Question 2

There is the difference in the concentration of water in the through and water in the cup (Potato).

Exosmosis takes place as the potato cells act as a semipermeable membrane.

Both A and B.

None of these

Solution

Question 3

Permeable membrane

Semi-permeable membrane

Membrane

None of these

Solution

Question 4

They do not exhibit osmosis.

They do not possess cell wall.

They are living cells.

They have intercellular spaces.

Solution

Question 5

In A no concentration gradient occurs, in D no semipermeable membrane present

In A no semipermeable membrane, in D no concentration gradient

Both A and B

None of these

Solution

Question 6

Concentration of water molecules inside and outside the cell

Concentration of enzymes on either side of the cell membrane

Rate of molecular motion on either side of the cell membrane

Rate of movement of insoluble molecules inside the cell

Solution

Question 7

1

2

3.5

0

Solution

Question 8

It acts as a control.

It acts as a accessory.

Both A and B

None of these

Solution

Question 9

Breakdown (lysis) of plasma membrane in hypotonic medium

Shrinkge of protoplasm in hypertonic medium

Shrinkage of nucleoplasm

None of the above

Solution

Question 10

Osmosis is a slow process, occurs down the concentration gradient and does not expend energy.

Electron microscope uses very high voltage electricity. It uses electromagnets instead of glass lenses and a beam of electrons instead of light.

The semipermeable membrane does not allow both solvent and solute molecules to pass through it.

Active transport of materials is rapid and usually, occurs against the concentration gradient involving carrier proteins and energy in the form of ATP.

Solution

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