Transport in Plants Test

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Transport in Plants Test - 49

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Question 1
1 / -0

A non living continuum of cells walls and intercellular spaces is

A
Ground complex

B
Alburnum

C
Apoplast

D
Desmotubule

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 C.
Question 2
1 / -0

Which of the following statement is wrong in root-presure concept of ascent of sap ?

A
Water can be raised to a height of 6'-7'.

B
Water moves upward in the absence of shoot.

C
Water moves by this force is slow.

D
Root pressure operates in all the plants.

Solution

Root pressure is not operated in lower plants and plants of small height and aquatic plants because they have several other mechanisms to conduct water. Root pressure occurs in the xylem of some vascular plants when the soil moisture level is high either at night or when transpiration is low during the day.
So the correct answer is 'Root pressure operates in all the plants'.
Question 3
1 / -0

The lowest water potential is found in the xylem channels of

A
Stem

B
Root

C
Root in the root hair zone

D
Leaves

Solution

The xylem channels of leaves have lowest water potential because they have very high solute concentration due to loss of water during transpiration. Thus, the correct answer is (D).
Question 4
1 / -0

Difference between active and passive modes of membrane transport is

A
Active transport is confined to cations while passive is connected to anions

B
Active transport is non-selective while passive one is selective

C
Active transport requires metabolic energy while passive transport requires concentration gradients

D
Active transport is more rapid.
Question 5
1 / -0

Root pressure may be caused by

A
Osmotic flow of water into xylem of absorbing part of root.

B
Loss of water from xylem of the plant due to transpiration.

C
Low water potential of leaves.

D
High water potential of leaves.

Solution

When there is no transpiration then due to lack of transpiration pull water does not move upwards. At this time through osmosis water is absorbed from the soil and it accumulates in xylem region of the root .The accumulation through osmosis causes root pressure and water moves upwards.
Thus, the correct option is (A).
Question 6
1 / -0

Water potential is equal to

A
$$ \psi_s + O.P. $$

B
$$ \psi_s = T.P. $$

C
$$ \psi_s + psi_w $$

D
$$ \psi_s + \psi_p $$

Solution

Water potential is the potential energy in water and derives the movement of water in plants. Plants used water potential to transport water to the leaves so that photosynthesis can take place. Water potential $$(Ψ)$$ is determined and influenced by two factors -osmotic potential (ΨS) and pressure potential $$(ΨP)$$.
So the correct answer is '$$Ψ = ΨS+ ΨP$$'.
Question 7
1 / -0

Root pressure is maximum at the time of

A
Water absorption as well as transpiration.

B
Both water absorption and transpiration are high.

C
Absorption is low and transpiration is high.

D
Absorption is high and transpiration is low.

Solution

Root pressure is the negative pressure which helps in the ascent of water. The driving forces for water flow from roots to leaves i.e. root pressure is the lesser force and is important mainly in small plants at times when transpiration is not substantial and absorption is high.
So the correct answer is 'Absorption is high and transpiration is low'.
Question 8
1 / -0

In hot summer day, plant cooling occurs due to

A
Transport of water from root to all parts of the plants.

B
Loss of liquid water

C
Water loss from entire plant

D
Loss of water vapour from foliar surface

Solution

In hot summer days when loss of water vapour occurs from foliar surface because these are the main site of water loss or transpiration and directly exposed to sunlight.
There is no effect on cooling of plants due to transport of water from root to all parts of the plant or water loss from entire plant.
Question 9
1 / -0

Compared to 1 M sucrose solution, the $$ \psi_w $$ of 1 M sodium chloride solution is

A
High

B
Same

C
Lower

D
None of the above

Solution

Water potential- it is the tendency of water to move from one area to another area[low to high]. Because $$NaCl$$ produces ions but sucrose doesn't produce ions. So $$NaCl$$ ions increases its DPD. Thus 1 M sodium chloride solution is higher than 1 M sucrose solution.
So the correct answer is 'High'.
Question 10
1 / -0

A bottle filled with previously moistened Mustard seeds and water was screw capped tightly and kept in a corner. It blew up suddenly after about half an hour. The penomenon involved is

A
Diffusion

B
Imbibition

C
Osmosis

D
D.P.D.

Solution

Imbibition is a special type of diffusion when water is absorbed by solids-colloids causing an enormous increase in volume. Examples include the absorption of water by seeds and dry wood.

When moistened mustard seeds are kept in a corner in a bottle then due to imbibition, seeds will absorb water and suddenly blew up.
So the correct answer is 'Imbibition'.

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Transport in Plants Test - 49

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Transport in Plants Test - 49

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SHARING IS CARING

Question 1

Ground complex

Alburnum

Apoplast

Desmotubule

Solution

Question 2

Water can be raised to a height of 6'-7'.

Water moves upward in the absence of shoot.

Water moves by this force is slow.

Root pressure operates in all the plants.

Solution

Question 3

Stem

Root

Root in the root hair zone

Leaves

Solution

Question 4

Active transport is confined to cations while passive is connected to anions

Active transport is non-selective while passive one is selective

Active transport requires metabolic energy while passive transport requires concentration gradients

Active transport is more rapid.

Question 5

Osmotic flow of water into xylem of absorbing part of root.

Loss of water from xylem of the plant due to transpiration.

Low water potential of leaves.

High water potential of leaves.

Solution

Question 6

$$ \psi_s + O.P. $$

$$ \psi_s = T.P. $$

$$ \psi_s + psi_w $$

$$ \psi_s + \psi_p $$

Solution

Question 7

Water absorption as well as transpiration.

Both water absorption and transpiration are high.

Absorption is low and transpiration is high.

Absorption is high and transpiration is low.

Solution

Question 8

Transport of water from root to all parts of the plants.

Loss of liquid water

Water loss from entire plant

Loss of water vapour from foliar surface

Solution

Question 9

High

Same

Lower

None of the above

Solution

Question 10

Diffusion

Imbibition

Osmosis

D.P.D.

Solution

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