Transport in Plants - Live Session - NEET 2020Contact Number: 9667591930 / 8527521718Transport in Plants - Live Session - NEET 2020Contact Number: 9667591930 / 8527521718In guard cells sugar is converted into starch, the stomatal pore
1. Opens partially
2. Closes completely
3. Opens completely
4. Remains unchanged
Water movement in plants is:
1. Down a potential gradient in apoplast and up the potential gradient in symplast
2. Down a potential gradient in symplast and up the potential gradient in apoplast
3. Up the potential gradient in both apoplast and symplast
4. Down the potential gradient in both apoplast and symplast
What are the control points where a plant adjusts the quantity and types of solutes that reach the xylem?
1. Suberin deposited Casparian strips
2. Transport proteins of endodermal cell
3. Sclerenchyma around the pericycle
4. The root hairs themselves
Consider the following two statements:
I. The direction of movement in the phloem is bi-directional.
II. The source-sink relationship in plants is variable.
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. Both I and II are incorrect
During translocation of sugars in plants from source to sink:
1. The loading of sugar at source is by active transport and unloading at the sink by passive transport.
2. The loading of sugar at source is by passive transport and unloading at the sink by active transport.
3. Both loading at the source and unloading at the sink are by active transport.
4. Both loading at the source and unloading at the sink are by passive transport.
It is a common observation that CAM plants are not tall. The reason most likely is:
1. They would be unable to move water and minerals to the top of the plant during the day.
2. They would be unable to supply sufficient sucrose for active transport of minerals into the roots during the day or night
3. Transpiration occurs only at night, and this would cause a highly negative 
in the roots of a tall plant during the day.
4. Since the stomata are closed in the leaves, the Casparian strip is closed in the endodermic strip is closed in the endodermis of the root.
Waterlogging or over-watering a plant is dangerous and may kill the plant. Why is this so?
1. Water does not have all the necessary minerals a plant needs to grow.
2. Water neutralizes the pH of the soil.
3. The roots are deprived of oxygen.
4. Water lowers the water potential of the roots.
The smallest amount of pressure needed to stop fluid from moving by osmosis is referred to as the
1. Turgor pressure
2. Water potential
3. Pressure potential
4. Osmotic potential
Consider the following:
I. A decrease in pressure on cell exerted by the wall
II. An increase in water potential of the surroundings
III. The uptake of solutes by the cell
IV. An increase in the tension on the surrounding solution
Which of these would contribute to the uptake of water by the cell?
1. I, II, III
2. II, III, IV
3. I, II, IV
4. I, III, IV
Pressure on a plant cell wall caused osmotic movement of water is called:
1. Osmotic pressure
2. Osmotic potential
3. Turgor pressure
4. Hypertonic pressure
Root pressured develops due to
1. active absorption
2. low osmotic potential in soil
3. passive absorption
4. increase in transpiration
A column of water within xylem vessels of tall trees does not break under its weight because of
1. dissolved sugars in water
2. tensile strength of water
3. lignification of xylem vessels
4. positive root pressure
Transpiration and root pressure cause water to rise in plants by
1. pulling it upward
2. pulling and pushing it, respectively
3. pushing it upward
4. pushing and pulling it, respectively
The translocation of organic solutes in sieve tube members is supported by:
1. root pressure and transpiration pull
2. P-proteins
3. mass flow involving a carrier and ATP
4. cytoplasmic streaming
In plants, water moves from
1. less negative to more negative potential
2. more negative to less negative potential
3. same potential
4. none of the above
The value of osmotic potential of an electrolyte is always
1. more than non-electrolyte
2. less than non-electrolyte
3. same as non-electrolyte
4. None of these
Which of the following statement is correct?
1. DPD = OP - WP
2. DPD = OP + WP
3. DPD = WP - OP
4. DPD = TP + OP
The ratio of osmotic pressure exerted by 1 M sucrose and 1M NaCl solution will be
1. 1
2. 2
3. 0.1
4. 0.5
Cell A has osmotic potential of -18 bars and pressure potential of 8 bars, whereas, cell B has osmotic potential of -14 bars and pressure potential 2 bars. The direction of flow of water will be
1. from cell B to cell A
2. from cell A to cell B
3. no flow of water
4. in both the directions
Water channels are made up of
1. Eight aquaporins
2. Eight different types of aquaporins
3. Ten aquaporins
4. Ten different types of aquaporins
Water is often a major limiting factor in
1. Photosynthesis
2. Respiration
3. Photorespiration
4. Plant Growth and Productivity
The greater water potential actually does not suggest the
1. Greater concentration of water
2. Greater Kinetic Energy
3. Less solute concentration
4. Lower solute potential
Find the correct one.
1. All the solute have lower water potential than pure water given that solution is under external pressure
2. All the solutions have lower water potential than the pure water
3. All the solutions have higher water potential than the pure water
4. All the solutions have lower water potential than pure water unless solution is under such external pressure which is more than the
solute potential
Solute potential is
1. More when solute is more
2. Less when solute is less
3. Always negative
4. All of these
For a solution at atmospheric pressure
1. Solute potential is more than water potential
2. Water potential more than solute potential
3. Solute potential is less than water potential
4. Water potential is equal to solute potential
The net movement of water is zero till
1. Dynamic equilibrium is reached
2. State equilibrium is reached
3. One chamber has transported all the water molecules
4. All of these
Solution of which chamber has a lower solute potential?
1. Chamber A
2. Chamber B
3. Both will have equal values
4. Cannot be predicted
Osmotic pressure is a function of
1. Osmotic potential
2. Solute concentration
3. Solvent amount
4. Water potential
Plasmolysis is
1. Usually reversible
2. Occurs when cell is placed in hypotonic external solution
3. Shrinkage of cytoplast
4. All of these
Imbibition
Find the incorrect one.
1. A special type of diffusion
2. Water is absorbed by solids-colloids
3. Causing an increase in volume
4. Absorption of water by seeds, dry wood and cell
In germination of seed, what is absorbent?
1. Seed
2. Water
3. Environment
4. Seeding
Mass flow or bulk flow system is the movement of substance in bulk or en masse from one point to another point as a result of
1. Pressure Difference between two points
2. Osmotic gradient between two points
3. Concentration gradient between two points
4. Cannot be predicted
Apoplast movement
Find the wrong one.
1. Dependent on gradient
2. Water movement is through mass flow
3. The continuous stream of water gets tension when water is absorbed by root hairs
4. Mass flow of water occurs due to adhesive and cohesive properties of water
Symplastic movement is slower than apoplastic movement
1. Because it involves cytoplasmic streaming always
2. Molecule has to enter through the cell membrane
3. Because it is down the gradient
4. All of these
Casparian strip makes
1. Endodermis impervious
2. Inner layer of cortex impervious
3. Outer layer pervious
4. More than one option is correct
The movement of water through apoplast stops at the level of .... . And crosses membrane to undergo symplast till xylem cells
1. Endodermis
2. Starch sheath
3. Inner layer of cortex
4. All of these
The path of water in xylem vessels and tracheids is
1. Symplast
2. Apoplast
3. Both 1 and 2
4. Depends on gradient
Root pressure
1. Pushing pressure
2. Negative pressure
3. Tries to cope up with water requirement of well heighted plants
4. Effects are observed at day time and evening time
Following are some statement which ones are not incorrect?
a. Root pressure only provide a modest push in the overall process of water transport
b. Root pressure obviously does not play a major role in water movement up tall trees
c. The greatest contribution of root pressure may be to re-establish the continuous chains of water molecules in the xylem which often
break under the enormous tensions created by transpiration
d. Most of the plants meet their need by transpiratory pull
e. The exudate of guttation has pure water only
1. a, b, d, e
2. a, b, c, d
3. b, c, d, e
4. c, d, e
Which of the following is a model for Transpiration?
1. Cohesion-Adhesion Transpiration Pull Model
2. Cohesion Tension Transpiration Pull Model
3. Tension Transpiration Pull Model
4. All of these
The immediate cause of opening and closing of stomata is a change in the
1. Turgidity of subsidiary cells
2. Flexibility of aperture
3. Change in the turgidity of guard cells
4. All of these
The opening of stoma is also ..... due to the orientation of the microfibril in the ..... of guard cells.
1. Supported, cytoplasm
2. Supported, cell wall
3. Affected, cell membrane
4. Affected, cytoplasm
Which of the following will not cause the stomata to close?
1. wilting
2. increase in carbon dioxide concentration
3. darkness
4. increase in pH
Pick the incorrect statement
1. Guard cells help balance the photosynthesis-transpiration compromise.
2. Water tension in a transpiring plant will exert a pull on water molecules lower down in the plant's vascular system.
3. Plants that live in deserts have adapted to constant water stress by using hydrophilic colloids to increase the water potential
of their tissues.
4. C3 plants can fixed double the carbon dioxide for half the water transpired.
What seems to be the most valid statement about root pressure?
1. It is the positive pressure responsible for transport of water most commonly.
2. It may provide a considerable push to the water column during transport.
3. It may help re-establish the broken water columns during transpiration.
4. Its effect is most observable during mid day.
The presence of free starch in the cell will serve to
1. Increase its water potential.
2. Decrease its water potential by virtue of solutes.
3. Increase solute potential by virtue of solutes.
4. Decrease its water potential by virtue of matric potential.
Translocation does not involve
1. A pressure difference between the source and the sink.
2. Same velocity of transport of all substance together.
3. Transport of each substance according to its concentration gradient.
4. None of the above.
One of the following is not a pre-requisite for transpiration?
1. High vapour pressure deficit of atmosphere
2. Low atmospheric humidity
3. High soil water potential
4. Sunny weather
Which is not an example of imbibition
1. Raisins soaked in water
2. Wheat grains soaked in water
3. Gram seeds soaked in water
4. A piece of wood soaked in water
When the cell is flaccid
1. Inflow and outflow of water is in equilibrium
2. Turgor pressure of the cell is 0
3. The cell has minimum volume
4. All of the above