Transport in Plants Test

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Transport in Plants Test - 62

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Question 1
1 / -0

Choose the correct answers from the alternatives given.
Root pressure can be measured by

A
Osmometer

B
Potometer

C
Manometer

D
Porometer

Solution

Different processes can be measured by various apparatus.
A. Osmometer is used to measure osmotic pressure (pressure needed to stop the solvent to pass through the semi-permeable membrane).
B. Potometer is used to measure transpiration rate (the rate at which transpiration occurs).
C. Manometer is used to measure the root pressure (pressure that is exerted by roots such that it allows sap to rise through the plant stem to the leaves).
D. Porometer is used to measure stomatal conductance in leaves.
Hence, the correct answer is 'Manometer'.
Question 2
1 / -0

Choose the correct answers from the alternatives given.
According to transpiration pull-cohesion theory of ascent of sap, water is pulled upward through the xylem. The cause of the pull is

A
Transpiration

B
Guttation

C
Root pressure

D
Condensation

Solution

Water is pulled upwards through the plants due to transpiration. Transpiration is the loss of water in the form of water vapour through stomata. The model that explains this translocation of water is called Cohesion-tension transpiration pull model of water transport. Less than one percent of water reaching the plant is used in photosynthesis and plant growth.
Hence, the correct answer is'Transpiration'.
Question 3
1 / -0

Water transport from roots to leaves is explained by

A
The pressure flow theory

B
Differences in source and sink solute concentrations

C
The pumping force of xylem vessels

D
The cohesion-tension theory.

Solution

The cohesion-tension theory explains the translocation of water by the process of transpiration. This theory was proposed by Dixon and Jolly and is popularly known as Cohesion-tension transpiration pull model of water transport. This pull helps in water transport from roots to the leaves. Less than one per cent of water is utilised in photosynthesis and plant growth. Most of the water is lost by transpiration through stomata. Cohesion keeps the water molecules stick together and adhesion allows the water molecules to stick to the xylem walls.
Hence,the correct answer is 'The cohesion-tension theory'.
Question 4
1 / -0

Choose the correct answers from the alternatives given.
Which of the following forces pushes water into the xylem as osmosis moves water into the root?

A
Water stress

B
Atmospheric pressure

C
Root pressure

D
Transpiration

Solution

Root pressure that is developed in the roots pushes the water into the xylem which is then distributed to different plant parts required for growth.
Water stress is the condition that pushes water to the shoot system but root pressure is the force that required to push water upwards.
Hence,the correct answer is 'Root pressure'.
Question 5
1 / -0

On a hot summer day cooling of the plant occurs due to

A
Loss of water vapours from leaf

B
Transport of water in plant

C
Loss of liquid water

D
Loss of water from entire plant

Solution

Loss of water from the surface of the leaves in form of water vapours is known as transpiration. This process causes the cooling effect in plants on a hot summer day. This process is similar to sweating that occurs in humans.
Hence, the correct answer is 'Loss of water vapours from leaf'.
Question 6
1 / -0

Choose the correct answers from the alternatives given.
Loss of water from the plants in the form of vapour state is known as

A
Guttation

B
Imbibition

C
Transpiration

D
Translocation
Solution
- Water loss from the leaves in the form of water vapour through the openings called stomata is called transpiration.
- Imbibition is a phenomenon that refers to the absorption of one substance by another, usually uptake of water by a plant or a seed.
- Guttation is excretion of xylem sap on the tips of some plants through pores called hydathodes.
- Translocation is the movement of the material from the source to sink inside the plant. Example, movement of starch from leaves to roots or other plant parts.
Hence, the correct answer is 'Transpiration'.
Question 7
1 / -0

Choose the correct answers from the alternatives given.
Exudation

A
Takes place during positive root pressure

B
Takes place during negative root pressure

C
Is unrelated with root pressure

D
Is related with photosynthesis

Solution

The exudation of liquid drops from the margin of the leaves is called guttation. This happens due to the development of high root pressure as a result of active or more absorption of water at night or early mornings and low transpiration rate. The positive pressure forces the liquid to come out through the special openings called hydathodes.
Hence, the correct answer is 'Takes place during positive root pressure'.
Question 8
1 / -0

Choose the correct answers from the alternatives given.
Which of the following structures or compartments is not part of the plants apoplast?

A
Lumen of a xylem vessel

B
Lumen of a sieve tube

C
Cell wall of a mesophyll cell

D
Cell walls of root hairs
Question 9
1 / -0

Choose the correct answers from the alternatives given.
The Casparian strip affects:

A
How minerals move but not water

B
How water and minerals move into the vascular cylinder

C
Neither the flow of water nor the flow of minerals into a plant

D
How water move but not minerals
Question 10
1 / -0

Choose the correct answers from the alternatives given.
The instrument which is used for measuring the humidity of air is known as

A
Hygrometer

B
Psychrometer

C
Auxanometer

D
Both A and B

Solution

A hygrometer is used to measure the humidity of the air. The psychrometer is a type of hygrometer containing both wet bulb and dry bulb thermometers to measure the humidity of the air.
Auxanometer is the device used to measure the increase in the growth of the plants.
Hence, the correct answer is 'Both A and B'.

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Re-Attempt Weekly Quiz Competition

Transport in Plants Test - 62

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Transport in Plants Test - 62

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SHARING IS CARING

Question 1

Osmometer

Potometer

Manometer

Porometer

Solution

Question 2

Transpiration

Guttation

Root pressure

Condensation

Solution

Question 3

The pressure flow theory

Differences in source and sink solute concentrations

The pumping force of xylem vessels

The cohesion-tension theory.

Solution

Question 4

Water stress

Atmospheric pressure

Root pressure

Transpiration

Solution

Question 5

Loss of water vapours from leaf

Transport of water in plant

Loss of liquid water

Loss of water from entire plant

Solution

Question 6

Guttation

Imbibition

Transpiration

Translocation

Solution

Question 7

Takes place during positive root pressure

Takes place during negative root pressure

Is unrelated with root pressure

Is related with photosynthesis

Solution

Question 8

Lumen of a xylem vessel

Lumen of a sieve tube

Cell wall of a mesophyll cell

Cell walls of root hairs

Question 9

How minerals move but not water

How water and minerals move into the vascular cylinder

Neither the flow of water nor the flow of minerals into a plant

How water move but not minerals

Question 10

Hygrometer

Psychrometer

Auxanometer

Both A and B

Solution

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