12th Grade > Biology
TRANSPORT IN PLANTS MCQs
Total Questions : 74
| Page 6 of 8 pages
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Pressure potential in any cell is created by the water present in the cytoplasm. When the water inside the cell comes out, the pressure on the cell wall becomes zero.
Question 52. 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.
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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.
Answer: Option C. -> upward movement of water
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C
The process of transpiration is responsible for the force that pulls water up in a very tall tree. It is responsible for the transpiration pull that causes the ascent of sap.
:
C
The process of transpiration is responsible for the force that pulls water up in a very tall tree. It is responsible for the transpiration pull that causes the ascent of sap.
Answer: Option A. -> Both A & R are true and R explains A
:
A
Active transport uses energy to pump molecules against concentration gradient i.e from the region of lower concentration to higher concentration and hence the transport is referred as uphill transport.
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A
Active transport uses energy to pump molecules against concentration gradient i.e from the region of lower concentration to higher concentration and hence the transport is referred as uphill transport.
Answer: Option B. -> Helps in translocation of sugars from source to sink
:
B
The loss of water from the aerial parts because of transpiration results in a tension in the xylem, which is responsible for absorption of water by roots. In transpiration, water is lost in the form of vapor, which has a cooling effect. Minerals are transported along with water to all parts of the plant, and water is transported by transpirational pull.
:
B
The loss of water from the aerial parts because of transpiration results in a tension in the xylem, which is responsible for absorption of water by roots. In transpiration, water is lost in the form of vapor, which has a cooling effect. Minerals are transported along with water to all parts of the plant, and water is transported by transpirational pull.
Answer: Option C. -> Both a & b
:
C
The diffusion rate depends on the size of the substances and smaller substances diffuse faster. Diffusion of any substance across the cell membrane also depends upon its solubility in lipids. It is not dependent on the living system itself.
:
C
The diffusion rate depends on the size of the substances and smaller substances diffuse faster. Diffusion of any substance across the cell membrane also depends upon its solubility in lipids. It is not dependent on the living system itself.
Answer: Option D. -> B to A, C and D
:
D
The amount by which diffusion pressure of a solution is lower than its pure solvent is known asDiffusion Pressure Deficit(or DPD). Pure solvent has no diffusion pressure defecit and therefore is DPD is 0. And solvent from here will move to a region of high DPD. Therefore movement will always be from a region of lower DPD to a region of higher DPD.
DPDs of B, C and D are as follows:
B: 5 - 5 = 0 bar
C: 10 - 4 = 6 bars
D: 8 - 3 = 5 bars
B having the least amount of DPD of just 0 bar, water will flow from B to A, C and D. And A and D having a lower DPD of 5 bars, compared to C, which has a DPD of 6 bars, water will flow from A and D to C also.
:
D
The amount by which diffusion pressure of a solution is lower than its pure solvent is known asDiffusion Pressure Deficit(or DPD). Pure solvent has no diffusion pressure defecit and therefore is DPD is 0. And solvent from here will move to a region of high DPD. Therefore movement will always be from a region of lower DPD to a region of higher DPD.
DPDs of B, C and D are as follows:
B: 5 - 5 = 0 bar
C: 10 - 4 = 6 bars
D: 8 - 3 = 5 bars
B having the least amount of DPD of just 0 bar, water will flow from B to A, C and D. And A and D having a lower DPD of 5 bars, compared to C, which has a DPD of 6 bars, water will flow from A and D to C also.
Answer: Option D. -> -8 MPa
:
D
Water moves from cell with water potential - 6 MPa to cell with water Potential - 10 MPa. At equilibrium water potential of both cells will become equal i.e., - 8 MPa ( average).
:
D
Water moves from cell with water potential - 6 MPa to cell with water Potential - 10 MPa. At equilibrium water potential of both cells will become equal i.e., - 8 MPa ( average).
Answer: Option A. -> True
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A
Lipid is the major component of the membrane. Substances soluble in lipids diffuse faster and substances with hydrophilic moieties, that dissolve in water cannot diffuse across the plasma membrane. They pass through themembrane only with the help of facilitating protein carriers.
:
A
Lipid is the major component of the membrane. Substances soluble in lipids diffuse faster and substances with hydrophilic moieties, that dissolve in water cannot diffuse across the plasma membrane. They pass through themembrane only with the help of facilitating protein carriers.
Answer: Option D. -> All of these
:
D
Water is essential for physiological activities of living organisms. 85−90% of water is present in protoplasm. Inorganic and organic solutes are transported along with water as it can act as a stable buffer to maintain optimum ph for ionic balance in plant cell.
:
D
Water is essential for physiological activities of living organisms. 85−90% of water is present in protoplasm. Inorganic and organic solutes are transported along with water as it can act as a stable buffer to maintain optimum ph for ionic balance in plant cell.
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