Transport in Plants Test

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Transport in Plants Test - 63

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Question 1
1 / -0

Choose the correct answers from the alternatives given.
An example of selectively permeable membrane is

A
Plasmalemma

B
Cell wall

C
Chloroplast membrane

D
Mitochondrial membrane

Solution

Cell membrane, also known as plasmalemma, is the innermost membrane of a plant cell. It is surrounded by a cell wall. The cell membrane is a selectively permeable membrane that allows only some type of compounds to pass through. The membrane has a phospholipid structure that contributes to this property.
Hence, the correct answer is 'Plasmalemma'.
Question 2
1 / -0

Choose the correct answers from the alternatives given.
Osmosis involves the physiological processes that

A
Maintain shape of the plant

B
Maintain growth of young cells

C
Maintain turgor of guard cells

D
All of these

Solution

Osmosis is a special type of diffusion of water. It is the passage of solvent molecules from a region of their higher concentration to a region of their lower concentration through a semi-permeable membrane.
It maintains the shape of the plant through the osmotic pressure developed in each cell. Since the passage of minerals of takes place through osmosis it also helps in plant growth. During endosmosis, turgor pressure is developed that causes the rigidity of the cells.
Hence, the correct answer is 'All of these'.
Question 3
1 / -0

Water passes into a cell due to __________.

A
OP

B
DPD

C
Turgor pressure

D
Diffusion

Solution

Cells gain or lose water among themselves on the basis of their water potential or DPD and not their solute or osmotic potentials only. Movement of water (solvent) takes place from lower DPD to high DPD or form higher water potential to lower water potential.
Question 4
1 / -0

If $$\Psi_w=$$ water potential; $$\Psi_s=$$ solute potential; $$\Psi_p=$$ pressure potential, then select the correct equation showing their inter-relation.

A
$$\Psi_w=\Psi_s-\Psi_p$$

B
$$\Psi_w=\Psi_s+\Psi_p$$

C
$$\Psi_s=\Psi_w+\Psi_p$$

D
$$\Psi_w=\Psi_s=\Psi_p$$

Solution

$$\Psi_w=\Psi_s+\Psi_p$$
where $$\Psi_w=$$ water potential; $$\Psi_s=$$ solute potential
and $$\Psi_p=$$ pressure potential.
So, the correct answer is '$$\Psi_w$$ = $$\Psi_s$$ + $$\Psi_p$$
Question 5
1 / -0

Water potential of a flaccid cell will be

A
$$\Psi_w=\Psi_s$$

B
$$\Psi_s=\Psi_p$$

C
$$\Psi_w=0$$

D
$$\Psi_w=\Psi_s-\Psi_p$$

Solution

If plant cell happens to be bathed in hypertonic solution, it loses water through the process of exosmosis. The loss of water is first from cytoplasm and then central vacuole. As a result, the protoplast is reduced in size. This decreases turgor pressure or pressure potential $$(\Psi_p)$$ and corresponding wall pressure. Solute potential becomes slightly more negative due to loss of water. The cell attains a minimum size when turgor pressure is zero/pressure potential $$(\Psi_p)$$ is zero.
Therefore, $$\Psi_w=\Psi_s+\Psi_p$$
or $$\Psi_w=\Psi_s$$(as $$\Psi_p=0$$)
A cell which is deficient in turgor is called flaccid.
So, the correct answer is '$$\Psi_w=\Psi_s$$'.
Question 6
1 / -0

Osmosis is a special kind of diffusion, through which water diffuses across the cell membrane. The rate and direction of osmosis depends upon

A
Pressure gradient

B
Concentration gradient

C
Both (a) and (b)

D
Availability of ATP
Solution
- Diffusion of water from its pure state(or dilute solution) into a solution (or stronger solution) when the two are separated by a semi-permeable membrane is termed osmosis.
- The net force or gradient is determined by the difference in the water potentials of solutions separated by a semipermeable membrane that in turn is determined by the sum of two forces, pressure gradient and concentration gradient.
ΨW = ΨS + ΨP
- Osmosis is a passive process just like diffusion i.e. do not utilize ATP.
So, the correct answer is option C.
Question 7
1 / -0

Water potential of a flaccid cell will be

A
$$\Psi _w$$ = $$\Psi _s$$

B
$$\Psi _s$$= $$\Psi _p$$

C
$$\Psi _w$$ = 0

D
$$\Psi _w$$ = $$\Psi _s$$ - $$\Psi _p$$

Solution

Pressure potential is negative in a plasmolysed cell and xylem vessel, positive for a turgid cell and zero for aflaccid cell.
So the correct answer should be option "ψw =0".
Question 8
1 / -0

Select the incorrect statement regarding imbibition.

A
Imbibition is the phenomenon of adsorption of water or any other liquid without forming solution

B
The liquid which is imbibed is called as imbibate

C
There occurs a decrease in volume of imbibant during imbibition

D
Water is absorbed by germinating seeds through imbibition

Solution

The adsorption of water by the solid particles of an adsorbent causing it to enormously increase in volume without forming a solution is called imbibition. Solid substances or adsorbents which take part in imbibition are called imbibants, e.g., seeds, dry wood. The liquid (usually water) which is imbibed is known as imbibate. The imbibate is held in between and over the surface of particles of the solid substance through the processes of capillarity and adsorption. During the process of imbibition, imbibants increase in volume. The swelling imbibant also develops a pressure called imbibition pressure (matric potential).
So, the correct answer is 'There occurs a decrease in volume of imbibant during imbibition'.
Question 9
1 / -0

In a fully turgid cell

A
$$\Psi_w=\Psi_s+\Psi_p$$

B
$$\Psi_w=$$ zero

C
$$\Psi_w=\Psi_s-\Psi_p$$

D
$$\Psi_w=\Psi_s=\Psi_p$$
Solution
Correct Option: B
Explanation:
- The cell turgor pressure is equal to solute potential when the cell is fully turgid.
- the water potential is denoted by Ψw.
- Ψw =Ψp + Ψp
- Now, the solute potential and pressure potential are opposite in sign.
- So, when there is a fully turgid cell, the water potential will become zero.
hence, in a fully turgid cell Ψw =0.
Question 10
1 / -0

In the given flow chart, the flow of water is shown from soil to xylem of the root. Identify the tissues involved in steps A and B.

A
A-Hypodermis; B-Protoxylem

B
A-Medullary rays; B-Phloem

C
A-Endodermis; B-Phloem

D
A-Endodermis; B-Protoxylem

Solution

Water and minerals are absorbed by root hairs. Water moves radially through the root before it begins its ascent towards the leaf. It moves through different tissue of the root in apoplastic and symplastic manner. Water enters the root through the root hair, travel through the cortex in an apoplastic manner., reaches the endoderms, the presence of casperian strips prevent apoplastic movement through endodermis. From here it travels symplastically through pericycle, protoxylem (exarch condition of root) to metaxylem and then ascends upwards.
So, the correct answer is 'A-Endodermis; B-Protoxylem'

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Transport in Plants Test - 63

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Transport in Plants Test - 63

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SHARING IS CARING

Question 1

Plasmalemma

Cell wall

Chloroplast membrane

Mitochondrial membrane

Solution

Question 2

Maintain shape of the plant

Maintain growth of young cells

Maintain turgor of guard cells

All of these

Solution

Question 3

OP

DPD

Turgor pressure

Diffusion

Solution

Question 4

$$\Psi_w=\Psi_s-\Psi_p$$

$$\Psi_w=\Psi_s+\Psi_p$$

$$\Psi_s=\Psi_w+\Psi_p$$

$$\Psi_w=\Psi_s=\Psi_p$$

Solution

Question 5

$$\Psi_w=\Psi_s$$

$$\Psi_s=\Psi_p$$

$$\Psi_w=0$$

$$\Psi_w=\Psi_s-\Psi_p$$

Solution

Question 6

Pressure gradient

Concentration gradient

Both (a) and (b)

Availability of ATP

Solution

Question 7

$$\Psi _w$$ = $$\Psi _s$$

$$\Psi _s$$= $$\Psi _p$$

$$\Psi _w$$ = 0

$$\Psi _w$$ = $$\Psi _s$$ - $$\Psi _p$$

Solution

Question 8

Imbibition is the phenomenon of adsorption of water or any other liquid without forming solution

The liquid which is imbibed is called as imbibate

There occurs a decrease in volume of imbibant during imbibition

Water is absorbed by germinating seeds through imbibition

Solution

Question 9

$$\Psi_w=\Psi_s+\Psi_p$$

$$\Psi_w=$$ zero

$$\Psi_w=\Psi_s-\Psi_p$$

$$\Psi_w=\Psi_s=\Psi_p$$

Solution

Question 10

A-Hypodermis; B-Protoxylem

A-Medullary rays; B-Phloem

A-Endodermis; B-Phloem

A-Endodermis; B-Protoxylem

Solution

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