Select Question Set:
Q. No.The given table shows a comparison of different transport mechanisms. Identify I, II and III:
I
II
III
Requires special membrane proteins
No
Yes
Yes
Highly selective
No
Yes
Yes
Transport saturates
No
Yes
Yes
Uphill transport
No
No
Yes
Requires ATP energy
No
No
Yes
Options:
I
II
III
1.
Simple diffusion
Facilitated diffusion
Active transport
2.
Facilitated diffusion
Simple diffusion
Active transport
3.
Simple diffusion
Active transport
Facilitated diffusion
4.
Facilitated diffusion
Active transport
Simple diffusion
Subtopic: Means of Transport: Active | Means of Transport: Passive |
89%
Level 1: 80%+
Hints
The diagram shows an experiment where a solution of sucrose in water taken in a funnel is separated from pure water in a beaker by a selectively permeable membrane. External pressure can be applied from the upper part of the funnel such that no water diffuses into the funnel through the membrane.
I: This pressure required to prevent water from diffusing is in fact, the osmotic pressure and this is the function of the solute concentration; more the solute concentration, greater will be the pressure required to prevent water from diffusing in.
II: Numerically, osmotic pressure is equivalent to the osmotic potential, but the sign is opposite. Osmotic pressure is the positive pressure applied, while osmotic potential is negative.
1. I is correct and II is also correct
2. I is correct but II is incorrect
3. I is incorrect and II is incorrect
4. I is incorrect and II is correct
I: This pressure required to prevent water from diffusing is in fact, the osmotic pressure and this is the function of the solute concentration; more the solute concentration, greater will be the pressure required to prevent water from diffusing in.
II: Numerically, osmotic pressure is equivalent to the osmotic potential, but the sign is opposite. Osmotic pressure is the positive pressure applied, while osmotic potential is negative.
1. I is correct and II is also correct
2. I is correct but II is incorrect
3. I is incorrect and II is incorrect
4. I is incorrect and II is correct
Subtopic: Water Potential Concept |
83%
Level 1: 80%+
Hints
The diagram shows the pathway of water movement in the root. Which of the following statements will be true?
I: The movement is relatively slower via the apoplast but the movement is down a potential gradient.
II: The symplast does not provide any barrier to water movement and water movement is through mass flow.
1. I is correct and II is also correct
2. I is correct but II is incorrect
3. I is incorrect and II is incorrect
4. I is incorrect and II is correct
I: The movement is relatively slower via the apoplast but the movement is down a potential gradient.
II: The symplast does not provide any barrier to water movement and water movement is through mass flow.
1. I is correct and II is also correct
2. I is correct but II is incorrect
3. I is incorrect and II is incorrect
4. I is incorrect and II is correct
Subtopic: Water Absorption |
64%
Level 2: 60%+
Hints
Look at the walls of the guard cells and the orientation of cellulosic microfibrils in them and select the correct statements:
Statement I: The inner wall of each guard cell, towards the pore or stomatal aperture, is thick and elastic.
Statement II: Cellulose microfibrils are oriented longitudinally rather than radially making it easier for the stoma to open.
1. Statement I is correct and statement II is also correct
2. Statement I is correct but statement II is incorrect
3. Statement I is incorrect and Statement II is incorrect
4. Statement I is incorrect and statement II is correct
Statement I: The inner wall of each guard cell, towards the pore or stomatal aperture, is thick and elastic.
Statement II: Cellulose microfibrils are oriented longitudinally rather than radially making it easier for the stoma to open.
1. Statement I is correct and statement II is also correct
2. Statement I is correct but statement II is incorrect
3. Statement I is incorrect and Statement II is incorrect
4. Statement I is incorrect and statement II is correct
Subtopic: Transpiration & Guttation |
78%
Level 2: 60%+
Hints
The diagram shows a schematic presentation of the Münch flow hypothesis. Identify the correct statements:
I. Sugars are loaded into the sieve tubes of the phloem at the sugar source (leaf). The osmotic pressure of the sieve tubes is decreased; water is taken up from the surrounding tissue, which results in an increase in turgor pressure at the source.
II. Unloading of sugars from the sieve tubes at the sinks (stem and roots) increases the sieve tube osmotic pressure, water escapes to surrounding tissue, and turgor pressure is reduced.
III. The turgor pressure gradient between the source and the sink is the driving force for phloem transport.
IV. Phloem function is linked to xylem transport as water circulates between the two tissues. Phloem takes up water from the xylem along the whole transport pathway unless sugar unloading is locally very large. The transpiration stream in the leaves can also pass apoplastically along the cell walls without crossing the membrane of cells.
1. I, II and III only
2. I, II and IV only
3. I, III and IV only
4. I, II, III and IV
I. Sugars are loaded into the sieve tubes of the phloem at the sugar source (leaf). The osmotic pressure of the sieve tubes is decreased; water is taken up from the surrounding tissue, which results in an increase in turgor pressure at the source.
II. Unloading of sugars from the sieve tubes at the sinks (stem and roots) increases the sieve tube osmotic pressure, water escapes to surrounding tissue, and turgor pressure is reduced.
III. The turgor pressure gradient between the source and the sink is the driving force for phloem transport.
IV. Phloem function is linked to xylem transport as water circulates between the two tissues. Phloem takes up water from the xylem along the whole transport pathway unless sugar unloading is locally very large. The transpiration stream in the leaves can also pass apoplastically along the cell walls without crossing the membrane of cells.
1. I, II and III only
2. I, II and IV only
3. I, III and IV only
4. I, II, III and IV
Subtopic: Ascent of Sap | Phloem Translocation | Long Distance Transport of Water |
Level 3: 35%-60%
Hints
The chief sink for the mineral elements in plants are all, except
1. Young leaves
2. Storage organs
3. Lateral meristems
4. Senescing parts
1. Young leaves
2. Storage organs
3. Lateral meristems
4. Senescing parts
Subtopic: Phloem Translocation |
71%
Level 2: 60%+
Please attempt this question first.
Hints
Please attempt this question first.
"Girdling Experiment" was performed by Plant Physiologists to identify the plant tissue through which:
| 1. | osmosis is observed |
| 2. | water is transported |
| 3. | food is transported |
| 4. | for both water and food transportation |
Subtopic: Phloem Translocation: Short Distance Transport | Phloem Translocation |
76%
Level 2: 60%+
Hints
Take two plants, keep plant A in very dry conditions and plant B in high humidity. Simultaneously, immerse the roots of both plants in water with a red dye. What would you observe?
1. Plant A turns redder than Plant B.
2. Plant B turns redder than Plant A.
3. Neither plant turns red.
4. Both plants turn equally red.
1. Plant A turns redder than Plant B.
2. Plant B turns redder than Plant A.
3. Neither plant turns red.
4. Both plants turn equally red.
Subtopic: Transpiration & Guttation |
64%
Level 2: 60%+
Please attempt this question first.
Hints
Please attempt this question first.
Consider the mode of transport shown in the given figure.
I: The mode of transport shown is facilitated diffusion.
II: Membrane proteins set up a concentration gradient for the substances to be transported across the membrane by this mode of transport.
1. I is correct and II is also correct
2. I is correct but II is incorrect
3. I is incorrect and II is incorrect
4. I is incorrect and II is correct
I: The mode of transport shown is facilitated diffusion.
II: Membrane proteins set up a concentration gradient for the substances to be transported across the membrane by this mode of transport.
1. I is correct and II is also correct
2. I is correct but II is incorrect
3. I is incorrect and II is incorrect
4. I is incorrect and II is correct
Subtopic: Means of Transport: Active |
52%
Level 3: 35%-60%
Hints
The ascent of xylem sap in plants is mainly accomplished by the:
| 1. | size of the stomatal aperture |
| 2. | distribution of stomata on the upper and lower epidermis |
| 3. | cohesion and adhesion between water molecules |
| 4. | root pressure |
Subtopic: Transpiration Pull: Illustration |
70%
Level 2: 60%+
NEET - 2022
Hints
Select Question Set:
© 2025 GoodEd Technologies Pvt. Ltd.