Transport in Plants Test

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Transport in Plants Test - 80

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is not a function of transpiration?

A
Uptake of water

B
Evaporation of water

C
Uptake of minerals

D
Excretion of minerals

Solution

Evaporation of water and uptake of minerals and water is a function of transpiration.
Transpiration causes water to take up the heat of the organs or the energy from sunlight and convert into water vapour causing evaporation of water.
Transpiration pull helps in ascent of xylem sap and hence helps in transportation of water and minerals.
Since water vapours are lost through transpiration, the minerals are left behind as they cannot evaporate along with water.
So the correct answer is 'Excretiom of minerals'.
Question 2
1 / -0

Transpiration is influenced by

A
pH

B
$$CO_2$$

C
hormone

D
all

Solution

Transpiration is influenced by pH, $$CO_2$$, hormones etc. It is largely dependent upon absorption of water from the soil.
Question 3
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The initial stage of water absorption by root cells is by

A
Absorption

B
Imbibition

C
Osmosis

D
Respiration

Solution

Imbibition is a type of diffusion wherein water is absorbed by the dry surface and increase in volume. In plants, this is seen in the initial stages of absorption of water by the cell walls of the root and root hairs.
Therefore, the correct answer is option B.
Question 4
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What would be the effect if a freshly cut end of a plant is put in eosin solution?

A
Leaves remain fresh but ascent of sap stops

B
Phloem gets colored because of ascent of sap

C
Xylem elements get stained showing ascent of sap through them

D
Ascent of sap stops

Solution

The ascent of sap refers to the upward movement of water and minerals from the root to the leaves of the plants. If the xylem tissue of plants is the upward movement of water and minerals from the root to the crown. This complex tissue made up of living and nonliving cells include vessels and tracheids When a freshly cut end of a plant is put in eosin solution the xylem elements gets stained which proves the ascent of sap through these cells.
So, the correct answer is option C.
Question 5
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Osmosis is the movement of

A
Solute particles from lower to higher concentration

B
Solute particles from higher to lower concentration

C
Solvent particles from lower to higher concentration

D
Solvent particles from highter to lower concentration
Solution
A.Correct option B

B.Explanation for correct option:
- Osmosis is the movement of solvent molecules through a semi-permeable membrane from a region of low solute concentration to a region of higher solute concentration.
- It does not require energy for movement and thus is the passive type of movement.
Question 6
1 / -0

In the cross section of a plant stem below, which structures transport water to the leaves?

A
Structure A

B
Structure B

C
Structure C

D
Structure D
Question 7
1 / -0

Root pressure is retarded or become absent in

A
Starvation

B
Low temperature

C
Drought

D
All

Solution

Root pressure is retarded or become absent under conditions of starvation, low temperature, drought and reduced availability of oxygen.
Question 8
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Study the following table showing the components of water potential of four cells of an actively transpiring monocot plant.
Cell Osmotic potential Pressure potential
(MPa) (MPa)
A -0.9 0.5
B -0.8 0.6
C -0.6 0.1
D -0.7 0.4
Identify the four cells as root hair, general cortical cell, passage cell, and pericycle cells of young root respectively (assume symplast flow).

A
B, D, A, C

B
B, D, C, A

C
A, D, B, C

D
B, C, D, A
Question 9
1 / -0

Living cells placed in an isotonic solution (0.9% saline) retain their size and shape. This is based on the concept of

A
Osmosis.

B
Diffusion.

C
Facilitated diffusion.

D
Transpiration.

Solution

Osmosis is the concept that involves the moment of water molecules inside and outside of the cell. Isotonic solution is the one in which the concentration of solute and water molecules are in equilibrium. If the cell is placed in isotonic solution the net change will be zero. So, the cells retain their size.
Question 10
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Study the following table showing the components of water potential of four cells of an actively transpiring plant.
Cell Solute potential (MPa) Pressure potential (MPa)
A - 0.68 0.42
B - 0.75 0.36
C - 0.83 0.47
D - 0.57 0.29
Identify the four cells as root hair, cortical cell, endodermal cell (lacking Casparian strips) and pericycle cell respectively in the young root (assuming symplastic water flow through them).

A
B, D, C, A

B
D, A, C, B

C
A, D, C, B

D
A, C, B, D

Solution

Cell A, B, C, D has water potentials respectively -0.26, -0.39, 0.36 and 0.28. So, A is root hair as it has highest water potential. When we go to towards the centre of the stem the water potential decreases. So, the B is pericycle, C is endodermal cell and D is cortical cell, as they are present towards the periphery respectively.

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Cell	Osmotic potential	Pressure potential
	(MPa)	(MPa)
A	-0.9	0.5
B	-0.8	0.6
C	-0.6	0.1
D	-0.7	0.4

Cell	Solute potential (MPa)	Pressure potential (MPa)
A	- 0.68	0.42
B	- 0.75	0.36
C	- 0.83	0.47
D	- 0.57	0.29

Transport in Plants Test - 80

Result

Transport in Plants Test - 80

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Rank

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SHARING IS CARING

Question 1

Uptake of water

Evaporation of water

Uptake of minerals

Excretion of minerals

Solution

Question 2

pH

$$CO_2$$

hormone

all

Solution

Question 3

Absorption

Imbibition

Osmosis

Respiration

Solution

Question 4

Leaves remain fresh but ascent of sap stops

Phloem gets colored because of ascent of sap

Xylem elements get stained showing ascent of sap through them

Ascent of sap stops

Solution

Question 5

Solute particles from lower to higher concentration

Solute particles from higher to lower concentration

Solvent particles from lower to higher concentration

Solvent particles from highter to lower concentration

Solution

Question 6

Structure A

Structure B

Structure C

Structure D

Question 7

Starvation

Low temperature

Drought

All

Solution

Question 8

B, D, A, C

B, D, C, A

A, D, B, C

B, C, D, A

Question 9

Osmosis.

Diffusion.

Facilitated diffusion.

Transpiration.

Solution

Question 10

B, D, C, A

D, A, C, B

A, D, C, B

A, C, B, D

Solution

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