12th Grade > Biology
TRANSPORT IN PLANTS MCQs
Total Questions : 74
| Page 3 of 8 pages
Answer: Option B. -> cohesive force
:
B
The intermolecular attractive forces between molecules of the same type, water molecules in this context, which hold them together is called cohesion. Adhesion is the attractive forces between different types of molecules, that is water and the capillary walls.
Capillarityis the tendency of a liquid in a capillary tube or absorbent material to rise or fall as a result of surface tension. The capillarity of water is due to its cohesive and adhesive forces.
:
B
The intermolecular attractive forces between molecules of the same type, water molecules in this context, which hold them together is called cohesion. Adhesion is the attractive forces between different types of molecules, that is water and the capillary walls.
Capillarityis the tendency of a liquid in a capillary tube or absorbent material to rise or fall as a result of surface tension. The capillarity of water is due to its cohesive and adhesive forces.
Answer: Option A. -> It occurs through specialized pores called hyathodes.
:
A
Guttation refers to the exudation of water droplets from the margins and tips of leaves. Guttation water is exuded from group of leaf cells through specialized openings or pores called hyathodes. It occurs in some angiosperms like garden nasturtium (Tropacolum) colocasia, tomato, etc., and is most noticeable where transpiration is suppressed and relative humidity is high such as during the night. It also takes place the early morning, when soil moisture, root pressure and rate of water absorption is higher.
:
A
Guttation refers to the exudation of water droplets from the margins and tips of leaves. Guttation water is exuded from group of leaf cells through specialized openings or pores called hyathodes. It occurs in some angiosperms like garden nasturtium (Tropacolum) colocasia, tomato, etc., and is most noticeable where transpiration is suppressed and relative humidity is high such as during the night. It also takes place the early morning, when soil moisture, root pressure and rate of water absorption is higher.
Answer: Option A. -> Aquatic, submerged plants
:
A
The loss of water from aerial parts of living plants is known as transpiration. Transpiration may be stomatal (80-90%), cuticular (3-9%) and lenticular (0.1%). Transpiration remain absent in submerged hydrophytic plants because stoma are completely absent in the leaves of the submerged plants, e.g Anacharis and Potamogeton.
:
A
The loss of water from aerial parts of living plants is known as transpiration. Transpiration may be stomatal (80-90%), cuticular (3-9%) and lenticular (0.1%). Transpiration remain absent in submerged hydrophytic plants because stoma are completely absent in the leaves of the submerged plants, e.g Anacharis and Potamogeton.
Answer: Option C. -> The RBC would increase in size and burst while the plant cell would remain about the same size
:
C
In both cases, endosmosis happens and the cells swell up. The RBC will ultimately burst. However, the plant cell will remain the same size due to the presence of a cell wall.
:
C
In both cases, endosmosis happens and the cells swell up. The RBC will ultimately burst. However, the plant cell will remain the same size due to the presence of a cell wall.
Question 25. Which of the following statements are wrong?
(i) Mass flow of substances inside the plant is the result of pressure differences between the two points
(ii) Diffusion cannot account for long distance movement of water and solutes in plants
(iii) Movement through apoplast does not involve crossing the cell membrane
(iv) The movement of water through endodermis is only through symplast
(i) Mass flow of substances inside the plant is the result of pressure differences between the two points
(ii) Diffusion cannot account for long distance movement of water and solutes in plants
(iii) Movement through apoplast does not involve crossing the cell membrane
(iv) The movement of water through endodermis is only through symplast
Answer: Option D. -> none
:
D
Mass flow of substances inside the plant is due to either a positive or a negative pressure gradient. Transport of substances can occur because of diffusion only through short distances. In the apoplast pathway, water moves outside the cell membrane. Endodermis has an impermeable casparian strip around the cell walls. Only some cells do not have the casparian strip, and water flows through these using the symplast pathway. Hence, none of the given statements is wrong.
:
D
Mass flow of substances inside the plant is due to either a positive or a negative pressure gradient. Transport of substances can occur because of diffusion only through short distances. In the apoplast pathway, water moves outside the cell membrane. Endodermis has an impermeable casparian strip around the cell walls. Only some cells do not have the casparian strip, and water flows through these using the symplast pathway. Hence, none of the given statements is wrong.
Answer: Option D. -> (a) and (b) above.
:
D
Some minerals are absorbed by the roots passively. However, most of the minerals are absorbed actively by roots since the concentration is higher in the soil than inside the root cells.
:
D
Some minerals are absorbed by the roots passively. However, most of the minerals are absorbed actively by roots since the concentration is higher in the soil than inside the root cells.
Answer: Option C. -> DPD = 0
:
C
The amount by which diffusion pressure of a solution is lower than that of the pure solvent is known as diffusion pressure deficit. DPD = OP - TP. When water enters into the cell, TP increases, turgidity increases and cell wall develops equal and opposite wall pressure. At the state of equilibrium, DPD will become zero.
:
C
The amount by which diffusion pressure of a solution is lower than that of the pure solvent is known as diffusion pressure deficit. DPD = OP - TP. When water enters into the cell, TP increases, turgidity increases and cell wall develops equal and opposite wall pressure. At the state of equilibrium, DPD will become zero.
Answer: Option C. -> Uphill transport
:
C
Facilitated transport is across the plasma membrane with the aid of carrier proteins. The process is highly selective, as each ion has a specific carrier protein and hence they are subject to saturationwhen all the carriers are occupied.
Although facilitated by carrier proteins, this process is still energy conducive because the transport occurs from theregion of high concentration to low concentration. And there is no uphill transport.
:
C
Facilitated transport is across the plasma membrane with the aid of carrier proteins. The process is highly selective, as each ion has a specific carrier protein and hence they are subject to saturationwhen all the carriers are occupied.
Although facilitated by carrier proteins, this process is still energy conducive because the transport occurs from theregion of high concentration to low concentration. And there is no uphill transport.
Answer: Option D. -> All of these
:
D
Growing regions of the plant such as the apical and lateral meristems, young leaves, developing flowers, fruits, seeds, and other storage organs aresinks for the storage of different minerals inside plants. Minerals from old and senescent leaves and other aging parts of the plant are mobilized to these regions, where they are utilized for growth and development.
:
D
Growing regions of the plant such as the apical and lateral meristems, young leaves, developing flowers, fruits, seeds, and other storage organs aresinks for the storage of different minerals inside plants. Minerals from old and senescent leaves and other aging parts of the plant are mobilized to these regions, where they are utilized for growth and development.
Question 30. Identify the correct statement related to water movement in deeper layers of the root.
A. Apoplastic movement of water does not involve the crossing of the cell membrane.
B. Symplastic movement is aided by cytoplasmic streaming.
C. Most of the water movement in the root is through symplast.
D. Water movement through the root layers is ultimately symplastic in the endodermis.
A. Apoplastic movement of water does not involve the crossing of the cell membrane.
B. Symplastic movement is aided by cytoplasmic streaming.
C. Most of the water movement in the root is through symplast.
D. Water movement through the root layers is ultimately symplastic in the endodermis.
Answer: Option D. -> A, B & D
:
D
Most of the water flow in the roots occurs via the apoplast since the cortical cells are loosely packed and hence offer no resistance to water movement. But movement through the endodermis layer alone is symplastic.
:
D
Most of the water flow in the roots occurs via the apoplast since the cortical cells are loosely packed and hence offer no resistance to water movement. But movement through the endodermis layer alone is symplastic.
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