Transport in Plants Test

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Transport in Plants Test - 65

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Weekly Quiz Competition

Question 1
1 / -0

Match the following and choose the correct option.

A. Leaves (i) Anti-transpirant
B. Seed (ii) Transpiration
C. Roots (iii) Negative osmotic potential
D. Aspirin (iv) Imbibition
E. Plasmolysed cell (v) Absorption

A
A-(ii), B-(iv), C-(v), D-(i), E-(iii)

B
A-(iii), B-(ii), C-(iv), D-(i), E-(v)

C
A-(i), B-(ii), C-(iii), D-(iv), E-(v)

D
A-(v), B-(iv), C-(iii), D-(ii), E-(i)

Solution

(A) Leaves - Transpiration
(B) Seed - Imbibition
(C) Roots - Absorption
(D) Aspirin - Anti-transpirant
(E) Plasmolysed cell - Negative osmotic potential
So, the correct answer is (a).
Question 2
1 / -0

Which of the following is an example of imbibition?

A
Uptake of water by root hair

B
Exchange of gases in stomata

C
Swelling of seed when put in soil

D
Opening of stomata

Solution

Imbibition is a process in which water is absorbed by solids-colloids causing them to enormously increase in volume. The classical examples of imbibition are absorption of water by seeds and dry wood.
Question 3
1 / -0

Mass flow hypothesis was first described by ___________.

A
Swanson

B
Buchman

C
Kursanov

D
Munch

Solution

Mass flow or pressure flow hypothesis was put forward by Munch $$(1927, 1930)$$. According to this hypothesis, organic substances move from the region of higher osmotic pressure to the region of lower osmotic pressure in a mass flow due to the development of a gradient.
So, the correct answer is 'Munch'
Question 4
1 / -0

A solution which can cause osmotic entry of water into is known as _______.

A
Hypertonic solution

B
Semi-osmotic solution

C
Osmotically active solution

D
Osmotic solution
Question 5
1 / -0

A 10% solution of which of the following substance shall have maximum osmotic potential

A
NaCl

B
Sucrose

C
Glucose

D
Fructose

Solution

Osmotic potential is noticed in electrolyte solutions than non - electrolyte solutions. Here NaCl is a electrolyte and glucose, sucrose, fructose are non electrolytes.
Nacl have more solute particles than other and as we know the value of osmotic pressure increase due to addition of solute particles.
So, the correct answer is 'NaCl'.
Question 6
1 / -0

Cell A and Cell B are adjacent plant cells. In cell A $$\psi_s = -20$$ bars and $$\psi_p = 8$$ bars. In cell B, $$\psi_s = -12$$ bars and $$\psi_p = 2$$ bars. Then,

A
water moves from cell A to cell B

B
there is no movement of water between cell A and cell B

C
water moves from cell B to cell A

D
equal amount of water is simultaneously exchanged between cell A and cell B.

Solution

During osmosis, water moves from a region of low salt concentration to a region of high salt concentration. From the data given in the question, it is evident that water will move from Cell B to Cell A.

So, the correct answer is 'water moves from cell B to cell A'.
Question 7
1 / -0

Vessel elements are

A
Dead at maturity

B
Are important constituents of all plants

C
Living at maturity

D
All of the above

Solution

Vessel elements are the cells that form vessels, a water conducting element in angiosperms. It is a type of xylem tissue. Vessels are not found in gymnosperms where the water conduction occurs by means of tracheids. Due to the presence of vessels, the angiosperm wood is called porous wood because the vessel elements have wider lumen. These cells lose their cytoplasm at the maturity due to the deposition of lignin in their walls. So, these are dead cells.
Hence, the correct answer is 'Dead at maturity'
Question 8
1 / -0

In plants, food and other substances are transported through

A
Companion cell

B
Vessels

C
Sieve tubes

D
Tracheid's
Solution
Sieve tubes and sieve cells are the vascular tissue called phloem.
These tubes help in transportation of prepared food, hormones and various amino acids.
This process of transportation of food is called translocation.
Question 9
1 / -0

Arrange the following in the increasing power of imbibition
Agar agar, cellulose, pectin, starch

A
Agar agar > cellulose > pectin > starch

B
Cellulose > starch > agar agar > pectin

C
Agar agar > pectin > starch > cellulose

D
Cellulose > agar agar > starch > pectin

Solution

Adsorption of water by hydrophillic colloids is known as imbibition solution. The cell wall is made of by colloidal substance as cellulose, pectin, hemicelluloses, etc. They are colloidal and hydrophobic in nature. Therefore they imbibe water. It is a physical process. Also, imbibition is special type of diffusion where net movement of water is along a diffusion gradient. It involves participation of an adsorbent called imbibant. Among plant imbibants phycocolloids e.g., Agar-agar are the best imbibants followed by pectin, starch and cellulose.
So, the correct answer is ''Agar agar > pectin > starch > cellulose''.
Question 10
1 / -0

Which of the following is true/false regarding transport of substances in plants?
(i) Mass flow is the movement of substance in bulk as a result of pressure difference.
(ii) Bulk flow is achieved only through a positive hydrostatic pressure gradient.
(iii) The apoplast system is the system of interconnected protoplasts.
(iv) Most of the water flow in the roots occurs via the apoplast since the cortical cells are loosely packed, and offer no resistance to water movement.

A
(i) and (iv) are true; (ii) and (iii) are false.

B
(i) and (ii) are true; (iii) and (iv) are false.

C
(ii) and (iii) are true; (i) and (iv) are false.

D
(i), (ii) and (iv) are true; (iii) is false.

Solution

(i) The movement of a substance in bulk as a result of pressure difference is called mass flow.

(ii) A positive hydrostatic pressure gradient usually results in mass flow.

(iii) The system of interconnected protoplasts is known as a symplastic system.

(iv) Most of the water flows in the via the apoplasts since the cortical cells are loosely packed, and offer no resistance to water movement.
So, the correct answer is '(i), (ii) and (iv) are true; (iii) is false.'

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Re-Attempt Weekly Quiz Competition

A. Leaves	(i) Anti-transpirant
B. Seed	(ii) Transpiration
C. Roots	(iii) Negative osmotic potential
D. Aspirin	(iv) Imbibition
E. Plasmolysed cell	(v) Absorption

Transport in Plants Test - 65

Result

Transport in Plants Test - 65

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SHARING IS CARING

Question 1

A-(ii), B-(iv), C-(v), D-(i), E-(iii)

A-(iii), B-(ii), C-(iv), D-(i), E-(v)

A-(i), B-(ii), C-(iii), D-(iv), E-(v)

A-(v), B-(iv), C-(iii), D-(ii), E-(i)

Solution

Question 2

Uptake of water by root hair

Exchange of gases in stomata

Swelling of seed when put in soil

Opening of stomata

Solution

Question 3

Swanson

Buchman

Kursanov

Munch

Solution

Question 4

Hypertonic solution

Semi-osmotic solution

Osmotically active solution

Osmotic solution

Question 5

NaCl

Sucrose

Glucose

Fructose

Solution

Question 6

water moves from cell A to cell B

there is no movement of water between cell A and cell B

water moves from cell B to cell A

equal amount of water is simultaneously exchanged between cell A and cell B.

Solution

Question 7

Dead at maturity

Are important constituents of all plants

Living at maturity

All of the above

Solution

Question 8

Companion cell

Vessels

Sieve tubes

Tracheid's

Solution

Question 9

Agar agar > cellulose > pectin > starch

Cellulose > starch > agar agar > pectin

Agar agar > pectin > starch > cellulose

Cellulose > agar agar > starch > pectin

Solution

Question 10

(i) and (iv) are true; (ii) and (iii) are false.

(i) and (ii) are true; (iii) and (iv) are false.

(ii) and (iii) are true; (i) and (iv) are false.

(i), (ii) and (iv) are true; (iii) is false.

Solution

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