Plant Physiology Test

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Plant Physiology Test - 2

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Question 1
1 / -0

Consider the following statements and mark your answer accordingly:

a. The direction of translocation is essentially multidirectional in case of water and unidirectional in case of minerals and organic solutes.
b. Substances move over short distances through diffusion and cytoplasmic streaming supplemented by active transport.

A
Both the statements are true.

B
Both the statements are false.

C
Statement 'a' is false and 'b' is true.

D
Statement 'b' is false and 'a' is true.

Solution

This is the correct option as statement 'a' is false. The direction of translocation is essentially unidirectional in case of water and multidirectional in case of minerals and organic solutes.
Question 2
1 / -0

In which of the following means of transport do the movable carrier proteins employ ATP energy for transport along the membrane?

a. Active transport
b. Diffusion
c. Facilitated diffusion

A
Only a

B
Only b

C
Only c

D
Only b and c

Solution

This is the correct option. In active transport, the movable carrier proteins employ ATP energy for transport along the membrane.
Question 3
1 / -0

Diffusion is the movement of particles from high concentration area to low concentration area. Which of the following factors influence diffusion?

a. Density
b. Permeability of medium
c. Temperature
d. Diffusion pressure gradient

A
Only a and b

B
Only c and d

C
Only a and d

D
All of these

Solution

This is the correct option as density, permeability of medium, temperature, and diffusion pressure gradient influence diffusion.
Question 4
1 / -0

Osmotic pressure is the pressure required to completely stop the entry of water into an osmotically active solution across a semipermeable membrane. Which of the following have the maximum osmotic pressure?

A
Aquatic plants

B
Halophytes

C
Mesophytes

D
Xerophytes

Solution

This is the correct option. Halophytes have the maximum osmotic pressure. Atriplex confertifolia shows an osmotic pressure of 202.4 atm.
Question 5
1 / -0

Osmosis is the movement of solvent or water from higher chemical potential to lower chemical potential when solute particles are not allowed to diffuse. Which of the following is the characteristic of osmosis?

A
It is purely dependent upon the free energy of the diffusing substance.

B
It operates only in a liquid medium.

C
It helps in equalising the concentration of the diffusing substance throughout the available space.

D
It is largely independent of the presence of other substances.

Solution

This is the correct option as this is the characteristic of osmosis. Osmosis operates only in a liquid medium.
Question 6
1 / -0

Turgor pressure is the pressure which develops in the confined parts of an osmotic system due to osmotic entry of water into it. Which of the following is not a function of turgor pressure?

A
The opening and closing of stomata are caused by gain and loss of turgidity by their guard cells.

B
Turgor pressure keeps a check on the excessive entry of water into cells.

C
Turgor pressure keeps the cells and their organelles contracted.

D
Many plant movements are produced due to reversible turgor changes in the cells.

Solution

This is the correct option as this is not a function of turgor pressure. Turgor pressure keeps the cells and their organelles stretched. This is essential for the proper functioning of a cell.
Question 7
1 / -0

Which of the following controls entry of water into cells and water relations among cells?

A
Diffusion pressure deficit

B
Wall pressure

C
Osmotic potential

D
Turgor pressure

Solution

This is the correct option. Diffusion pressure deficit controls entry of water into cells and water relations among cells. It also determines whether a cell will lose or gain water from an external solution or adjacent cells.
Question 8
1 / -0

Deplasmolysis is the swelling up of a plasmolysed protoplast under the influence of hypotonic solution or water. Which of the following is a characteristic of deplasmolysis?

A
Deplasmolysis is not reversible.

B
Deplasmolysis is a result of exosmosis.

C
Deplasmolysis involves shrinkage of protoplast from the cell wall.

D
During deplasmolysis, water diffuses into protoplast.

Solution

This is the correct option as this is a characteristic of deplasmolysis. During deplasmolysis, water diffuses into protoplast.
Question 9
1 / -0

Which of the following products is/are eliminated by plants by diffusion through stomata, lenticels and epidermis?

A
Gases

B
Water

C
Solutes

D
None of these

Solution

This is the correct option. Gases are eliminated by plants by diffusion through stomata, lenticels and epidermis. They are transported by diffusion through intercellular spaces.
Question 10
1 / -0

Water absorption is of two types - active and passive. Which of the following statements about passive water absorption is correct?

A
It can occur even in the absence of roots.

B
Root cells play an active role in this type of water absorption.

C
Force for this type of water absorption lies in the roots.

D
This type of water absorption is immediately influenced by metabolic poisons.

Solution

This is the correct option as this statement is correct. Passive water absorption can occur even in the absence of roots.
Question 11
1 / -0

Which of the following theories explaining the mechanism of ascent of sap believes that the innermost cortical cells of the root absorb water from the outer side and pump the same into xylem channels?

A
Root pressure theory

B
Theory of capillarity

C
Vital force theory

D
Cohesion tension theory

Solution

This is the correct option. Vital force theory believes that the innermost cortical cells of the root absorb water from the outer side and pump the same into xylem channels.
Question 12
1 / -0

Which of the following types of transpiration occurs through corky covering of the stems continuously during day and night?

A
Bark transpiration

B
Stomatal transpiration

C
Cuticular transpiration

D
Lenticular transpiration

Solution

This is the correct option. Bark transpiration occurs through corky covering of the stems continuously during day and night.
Question 13
1 / -0

The loss of water in the vapour form from the exposed parts of a plant is called transpiration. Which of the following is a plant factor affecting transpiration?

A
Availability of water

B
Air movement

C
Root/shoot ratio

D
Atmospheric pressure

Solution

This is the correct option as root/shoot ratio is a plant factor affecting transpiration. A low root/shoot ratio decreases the rate of transpiration, while a high ratio increases the rate of transpiration. The latter is due to the fact that an extensive root system is more efficient in water uptake from soil.
Question 14
1 / -0

Translocation of organic solutes can occur in different directions. Which of the following translocations is little, except when source and sink lie on the opposite sides?

A
Bidirectional translocation

B
Downward translocation

C
Upward translocation

D
Lateral translocation

Solution

This is the correct option. Lateral translocation is little, except when source and sink lie on the opposite sides.
Question 15
1 / -0

Consider the following statements and mark your answer accordingly:

a. There are only two paths for long distance translocation, tracheary elements and sieve tubes.
b. Sucrose is the most suitable form of carbohydrate translocation as it is non reducing and chemically stable.

A
Both the statements are true.

B
Both the statements are false.

C
Statement 'b' is true and 'a' is false.

D
Statement 'a' is true and 'b' is false.

Solution

This is the correct option as both the statements are true. There are only two paths for long distance translocation, tracheary elements and sieve tubes. The former are dead, while the latter are living. Sucrose is the most suitable form of carbohydrate translocation as it is non reducing and chemically stable. It does not react with other substances during translocation.

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Plant Physiology Test - 2

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Plant Physiology Test - 2

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Question 1

Both the statements are true.

Both the statements are false.

Statement 'a' is false and 'b' is true.

Statement 'b' is false and 'a' is true.

Solution

Question 2

Only a

Only b

Only c

Only b and c

Solution

Question 3

Only a and b

Only c and d

Only a and d

All of these

Solution

Question 4

Aquatic plants

Halophytes

Mesophytes

Xerophytes

Solution

Question 5

It is purely dependent upon the free energy of the diffusing substance.

It operates only in a liquid medium.

It helps in equalising the concentration of the diffusing substance throughout the available space.

It is largely independent of the presence of other substances.

Solution

Question 6

The opening and closing of stomata are caused by gain and loss of turgidity by their guard cells.

Turgor pressure keeps a check on the excessive entry of water into cells.

Turgor pressure keeps the cells and their organelles contracted.

Many plant movements are produced due to reversible turgor changes in the cells.

Solution

Question 7

Diffusion pressure deficit

Wall pressure

Osmotic potential

Turgor pressure

Solution

Question 8

Deplasmolysis is not reversible.

Deplasmolysis is a result of exosmosis.

Deplasmolysis involves shrinkage of protoplast from the cell wall.

During deplasmolysis, water diffuses into protoplast.

Solution

Question 9

Gases

Water

Solutes

None of these

Solution

Question 10

It can occur even in the absence of roots.

Root cells play an active role in this type of water absorption.

Force for this type of water absorption lies in the roots.

This type of water absorption is immediately influenced by metabolic poisons.

Solution

Question 11

Root pressure theory

Theory of capillarity

Vital force theory

Cohesion tension theory

Solution

Question 12

Bark transpiration

Stomatal transpiration

Cuticular transpiration

Lenticular transpiration

Solution