Transport in Plants Test

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Transport in Plants Test - 21

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Question 1
1 / -0

Addition of a solute to pure water causes

A
Negative water potential

B
More negative water potential

C
Positive water potential

D
More positive water potential

Solution

Water potential of pure water is zero. Addition of any solute will cause a reduction in the relative number of water molecules as compared to pure water. This reduction in number of water molecules is responsible for reduction in water potential. Hence, water potential of any solution will always be negative.
Question 2
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Wilting of leaves in hot weather is due to

A
Excessive transpiration.

B
Excess of transpiration as compared to water absorption.

C
Excessive water absorption by roots.

D
None of the above.

Solution

Wilting is the condition in plants in which cells lose their turgidity and young leaves and stems droop etc. It results because of the excess of transpiratory water loss over absorption. Water escapes from the leaves through stomata by the process called transpiration. As the water is pulled up through the xylem, it forms a continuous column as the water molecules are held together by capillary forces and this forms water chains which keep the plants turgid. As the water absorption becomes less when there is less water available in the soil for absorption and transpiration continues to occur, water chains in xylem become thinner and the plant loses its turgidity and begins to wilt.
So, the correct answer is B.
Question 3
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Select the correct events leading to the opening of the stomata
(i) Decline in guard cell solutes
(ii) Lowering of osmotic potential of guards cells
(iii) Rise in potassium levels in guard cell
(iv) Movement of water from neighbouring cells into guard cells
(v) Guards cells becoming flaccid

A
(i) and (v) only

B
(i), (ii), (iii) and (iv) only

C
(i), (iii) and (iv) only

D
(ii), (iv) and (v) only

E
(iii) and (v) only

Solution

The stomatal movement depends on the factors like a movement of potassium, availability of water, concentration of carbon dioxide, sunlight etc. Stomatal opening is accompanied by lowered osmotic pressure in guard cell i.e., declining of solute in guard cells, the rise in potassium concentration and movement of water inside the guard cells, which makes them turgid. Thus, the correct answer is option B.
Question 4
1 / -0

Osmoscope is used for

A
Measuring OP

B
Measuring TP

C
Measuring psi

D
Demonstration of osmosis

Solution

Osmosis is the process of movement of water across a semipermeable membrane along the concentration gradient. Osmoscope is used to demonstrate the process of osmosis. Usually a potato osmoscope is used in which a sugar solution is placed inside a cavity carved out in a potato tuber, which is kept in water. After some time due to osmosis level of solution inside the cavity rises, because water from surrounding cells enter the cavity.
Question 5
1 / -0

Who had said that ''transpiration is a necessary evil''?

A
Curtis

B
Steward

C
Andersen

D
J.C. Bose

Solution

Transpiration may be regarded as beneficial to the plants due to its role in ascent of sap, absorption and translocation of mineral salts and in the regulation of temperature of plant tissues. But transpiration also causes loss of water unnecessarily, therefore Curtis called transpiration a necessary evil.
Question 6
1 / -0

By which process atmospheric temperature is maintained?

A
Transpiration

B
Respiration

C
Photosynthesis

D
Phosphorylation

E
None of the above

Solution

Transpiration results in loss of water in vapour form. Water vapours are a prominent green house gas, responsible for maintenance of temperature on earth.
Question 7
1 / -0

Root hair absorb water from the soil on account of

A
Turgor pressure

B
Osmotic pressure

C
Suction pressure

D
Root pressure

Solution

Plants absorb water through their root hairs. The cell wall of the root hair is permeable to water and minerals, but its cell membrane and the membrane around the vacuole form semi-permeable membranes. Soil solution is a weaker solution as compared to the cell sap of root hair. Because of this osmosis occurs and the water is absorbed by the root hairs through cell membranes from the soil. The cells of cortex have higher osmotic pressure which causes the diffusion of water from the root hair to cortical cells
So, the correct answer is 'Osmotic pressure'
Question 8
1 / -0

In plants, water supply is due to

A
Osmosis

B
Imbibition

C
Guttation

D
Adhesion force

Solution

If the solute concentration is high and water potential is low then water moves from soil to root xylem. This process is known as osmosis. Guttation basically the loss of water in the form of liquid drops from the plants. Imbibition is the phenomena of adsorption of water from solid particle surface without forming the solution. Adhesion force is the force that helps to stick water to the surface of the cell and thus pull water from stem to leaves
So, the correct answer is 'Osmosis'
Question 9
1 / -0

In both transpiration and evaporation, water is lost in the form of vapour yet they differ, because

A
Both transpiration and evaporation are similar but the rate of water loss in transpiration is always more

B
Frequency of water loss is different in both of them.

C
Transpiration is a physical process and evaporation is a physiological process.

D
Transpiration is a physiological process and evaporation is a physical process.

Solution

Transpiration is loss of water in vapor form, from living plant cells thus it is a physiological process while evaporation is loss of water from any free surface in vapor form, thus it is a physical process.
Question 10
1 / -0

Which of the following plants economizes transpirational loss of water?

A
$$C_{3}$$

B
$$C_{4}$$

C
Both equally

D
$$C_{2}$$

Solution

$$C_4$$ plants grow in tropics under conditions of high temperature and high light intensity. These plants have better water use efficiency as compared to $$C_3$$ plants. These plants use PEP carboxylase for initial carbon dioxide fixation, which is able to fix carbon dioxide very efficiently. Also, internal concentration of carbon dioxide reduces the need to keep stomata open. Thus, it reduces transpiration loss of water.

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Transport in Plants Test - 21

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Transport in Plants Test - 21

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SHARING IS CARING

Question 1

Negative water potential

More negative water potential

Positive water potential

More positive water potential

Solution

Question 2

Excessive transpiration.

Excess of transpiration as compared to water absorption.

Excessive water absorption by roots.

None of the above.

Solution

Question 3

(i) and (v) only

(i), (ii), (iii) and (iv) only

(i), (iii) and (iv) only

(ii), (iv) and (v) only

(iii) and (v) only

Solution

Question 4

Measuring OP

Measuring TP

Measuring psi

Demonstration of osmosis

Solution

Question 5

Curtis

Steward

Andersen

J.C. Bose

Solution

Question 6

Transpiration

Respiration

Photosynthesis

Phosphorylation

None of the above

Solution

Question 7

Turgor pressure

Osmotic pressure

Suction pressure

Root pressure

Solution

Question 8

Osmosis

Imbibition

Guttation

Adhesion force

Solution

Question 9

Both transpiration and evaporation are similar but the rate of water loss in transpiration is always more

Frequency of water loss is different in both of them.

Transpiration is a physical process and evaporation is a physiological process.

Transpiration is a physiological process and evaporation is a physical process.

Solution

Question 10

$$C_{3}$$

$$C_{4}$$

Both equally

$$C_{2}$$

Solution

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