Transport in Plants Test

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Transport in Plants Test - 56

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Question 1
1 / -0

Most water flow in root occurs via apoplast as

A
Cortical cells are living cells

B
Cortical cells are loosely arranged

C
Cortical cells are thin walled

D
All the above

Solution

Most of the water flow in the roots occurs via Apoplast since the cortical cells are loosely packed, and hence offer no resistance to water movement.
So, the answer is, "Cortical cells are loosely arranged".
Question 2
1 / -0

Which pathway involves cell wall and intercellular spaces both?

A
Vascular pathway

B
Protoplast pathway

C
Symplast pathway

D
Apoplast pathway

Solution

Water is absorbed by the root hair from the soil. It passes the epidermis, cortex, endodermis, casparian strip and pericycle and xylem. After reaching the xylem it is pulled up by the transpirational pull.
Apoplast absorption is a type of absorption where the water moves through the cell wall and intercellular spaces between the two cell.
So, the correct answer is option D.
Question 3
1 / -0

Solute potential of a solution is always

A
= 0

B
< 0

C
> 0

D
Between 0.1 - 1.0

Solution

The solute potential is also known as osmotic potential can be represented by Ψs. It is one of the components of water potential. When the addition of solute in water results in the decrease in the amount of free energy of water molecules, this is called solute potential. Pure water's solute potential is zero because it does not contain any amount of solute in the water. Increase in the number of solute results in the decrease in the water potential, and therefore solute potential is always negative. The water potential of all other solutions is lower than zero, i.e, negative. As a result of this water potential of a solution drops and water will contribute to moving into the solution which causes water potential to decreases.
So, the correct answer is option B.
Question 4
1 / -0

Bacteria cannot survive in a pickle with high salt concentration because

A
Salt inhibits reproduction of bacteria.

B
They will be killed due to plasmolysis.

C
Nutrients in it cannot support life.

D
Enough light is not available for photosynthesis.

Solution

Plasmolysis is an organical phenomenon of exosmosis when a cell or tissue is kept on a strong hypertonic solution (more salt and less water), shrinkage of the protoplast of a cell from its cell wall occurs and the cell dies. Even bacteria and fungi cannot grow in the hypertonic solution because they cannot survive in a pickle with high salt concentration as it is killed by plasmolysis. Plasmolysis fundamentals are practiced in pickle making and canned foods/fruits.
So, the correct answer is option B.
Question 5
1 / -0

Which of these is not directly connected with ascent of sap?

A
Cohesion theory

B
Root pressure

C
Apoplast and symplast

D
Capillarity
Solution
Apoplastic pathway-
- Cell walls & intercellular space
- Nonliving path
Symplastic path
Systems of interconnected protoplasts, plasmodesmata
Living path
So, the correct answer is 'Apoplast and Symplast'.
Question 6
1 / -0

Osmometer having 0.5 M solution can made to shrink when immersed in ............... solution

A
0.05 M

B
0.75 M

C
0.5 M

D
Distilled water

Solution

Osmometer will shrink when it is placed in a hypertonic solution. It loses water due to osmosis and shrinks. So the only solution which is hypertonic to the osmometer is 0.75 M.
So the correct answer is '0.75 M'.
Question 7
1 / -0

Water potential of pure water and its solution are

A
0 and 1

B
0 and 0

C
0 and more than 1

D
0 and less than 1

Solution

The water potential of pure water in an open container is zero, the addition of solute only lowers the water potential.
So, the answer is, "0 and less than 1".
Question 8
1 / -0

Water absorption by root hair occurs until

A
Concentration of water in the cell sap is higher

B
Salt concentration in cell sap is higher

C
They are separated from the soil by a selectively permeable membrane

D
Water potential is lower
Solution
- Water potential is the measure of the relative tendency of water to move inside or outside the cell.
- Movement of water will be from high to low concentration.
- This term was first coined by Slatyer and Taylor in the year 1818.
So, the correct answer is 'Water potential is lower'.
Question 9
1 / -0

Which of the following is not the purpose of transpiration process?

A
Supplying water for photosynthesis

B
Maintaining shape and structure of plants

C
Translocation of sucrose from source to sink

D
Cooling the leaf surfaces

Solution

Transpiration is the process of loss of water through the aerial parts of the plant. It depends upon the amount of humidity level of the atmosphere.
When there is a high level of moisture then there is no concentration gradient between leaf and the atmosphere there is a minimum loss of water through transpiration.
So, the correct answer is 'Translocation of sucrose from source to sink'.
Question 10
1 / -0

Water potential of water is not affected by

A
Concentration of dissolved substances.

B
Gravitation

C
Capillarity

D
Atmospheric pressure

Solution

(A) Solute added in pure water lowers the water potential and is determined by the concentration.
(B) Gravitation either increases or decreases the water potential depending on the direction.
(C) Capillarity is caused by surface tension which doesn't affect water potential.
(D) When pressure is exerted by the atmosphere, it increases the Water potential.
So, the answer is, "Capillarity".

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Re-Attempt Weekly Quiz Competition

Transport in Plants Test - 56

Result

Transport in Plants Test - 56

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SHARING IS CARING

Question 1

Cortical cells are living cells

Cortical cells are loosely arranged

Cortical cells are thin walled

All the above

Solution

Question 2

Vascular pathway

Protoplast pathway

Symplast pathway

Apoplast pathway

Solution

Question 3

= 0

< 0

> 0

Between 0.1 - 1.0

Solution

Question 4

Salt inhibits reproduction of bacteria.

They will be killed due to plasmolysis.

Nutrients in it cannot support life.

Enough light is not available for photosynthesis.

Solution

Question 5

Cohesion theory

Root pressure

Apoplast and symplast

Capillarity

Solution

Question 6

0.05 M

0.75 M

0.5 M

Distilled water

Solution

Question 7

0 and 1

0 and 0

0 and more than 1

0 and less than 1

Solution

Question 8

Concentration of water in the cell sap is higher

Salt concentration in cell sap is higher

They are separated from the soil by a selectively permeable membrane

Water potential is lower

Solution

Question 9

Supplying water for photosynthesis

Maintaining shape and structure of plants

Translocation of sucrose from source to sink

Cooling the leaf surfaces

Solution

Question 10

Concentration of dissolved substances.

Gravitation

Capillarity

Atmospheric pressure

Solution

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