16433.The membrane which allows the movement of only water molecules to pass through it and not the solute particles
Permeable membrane
Semipermeable membrane
Imperimeable membrane
Not permeable
16435.Diffusion of water from selectively permeable membrane is known as
Active absorption
Passive absorption
Osmosis
Diffusion
16436.Bacteria cannot survive in a highly salted pickle because
Salt inhibits reproduction of bacteria
Enough light is available for photosynthesis
They become plasmolysed and death occurs
Nutrients in the pickle medium can not support life
16437.In order to demonstrate root pressure, the plant is given a cut
at the tip
transition zone
a few centimeters above the soil
a few centimeters below the soil
16438.Cell wall of root hair has two layers outer and inner which are made up of
Pectin and lignin respectively
Pectin and cellulose respectively
Cellulose and pectin respectively
Lignin and cellulose respectively
16439.The outer solution having equal concentration as that of the cell sap is called
Hypotonic solution
Isotonic solution
Hypertonic solution
Neutral solution
16442.A cell increase in volume when it is placed in
Hypertonic solution
Hypotonic solution
Isotonic solution
None of these
16443.Endosmosis occurs when the plant cell is placed in
Strong solution
Isotonic solution
Hypotonic solution
Hypertonic solution
16444.Pressure developed on cell wall of plant cell caused by osmotic movement of water is called as
Turgor pressure
Osmotic pressure
Suction pressure
DPD
16445.The pathway in which water moves through cell wall without crossing any membrane
Apoplast pathway
Symplast pathway
Vaculoar pathway
Transmembrane pathway
16446.Symplastic movement of water takes place through
The cell wall
The plasmodesmata
The casparian strips
Through endodermis
16447.Water diffusion into endodermis takes place through
Lignified cells
Casparian strips
Passage cells
Suberzed cells
16448.The hydrostatic pressure which is developed due to accumulation of water absorbed by roots is called
Turgor pressure
Wall pressure
Root pressure
Diffusion pressure
16450.The most widely accepted theory for ascent of sap is
Root pressure theory
Pulsatory theory
Capillarity theory
Cohesion theory
16451.The rate of absorption of water _____ with increase in salt concentration in the soil
Remains unchanged
Increases
Decreases
No effect
16452.Root pressure is due to
Active absorption
Passive absorption
Increased turgidity
Increased transpiration
16453.Absorption of water from cut ends of stems disapproves the theory of
Capillarity
Cohesion-tension theory
Root pressure theory
Imbibitional pressure theory
16454.Which of the following physical forces are supposed to be responsible for ascent as sap?
Imbibition
Capillary force
Transpiration pull and cohesion
Root pressure
16455.The ascent of sap takes place in
Xylem parenchyma
Walls of tracheary elements
Tracheids with associated xylem parenchyma
Lumen of tracheary elements
16457.Lignin and cellulose present in xylem vessels shows affinity for water due to
Adhesive forces
Cohesive forces
Water potential d. Wall pressure
16458.The rapid type of water absorption is
Active absorption
Passive absorption
Active osmotic absorption
Active non-osmotic absorption
16459.Which of the following will be zero in a fully turgid cell?
Wall pressure
Suction pressure (DPD)
Turgor pressure
Imbibitional pressure
16460.Root hairs absorb water from soil when
osmotic concentration is same in the two
solute concentration is higher in soil solution
solute concentration is higher in root hairs
absorption is active
16462.Pickes, jam, jellys has low risk of spoilage as they causes
Cuttation
Diffusion
Plasmolysis
Imbibition
16463.Stomata open and close due to
Tugor pressure of guard cells
Root pressure
Positive pressure
Imbibitional pressure
16464.Cohesion – transpiration pull theory operates only in
Active water absorption
Passive water absorption
Conditions opposing transpiration
Conditions favouring transpiration
16465.Stomata opens because the guard cells have-
Outer thin walls
Chloroplast
Inner thick walls
Kidney shape
16466.Transpiration through small openings present in bark of woody stem surrounded by complementary cells is
Stomatal transpiration
Cuticular transpiration
Lenticular transpiration
Foliar transpiration
16467.Transpiration through leaves in called as
Cauline transpiration
Foliar transpiration
Cuticular transpiration
Lenticular transpiration
16468.The total losss of water taking place in a plant due to lenticular transpiration is
1%
10%
0.1%
0.01%
16469.Cohesion-tension theory is related to ________.
respiration
ascent of sap
transpiration
photosynthesis
16470.The special modified epidermal cells surrounding stomatal pore are called
Epithelial cells
Guard cells
Subsiduary cells
Accessory cells
16471.The membrane which allows passage of solvent as well as some selective solutes and prevents others is called
Permeable membrane
Semipermeable membrane
Selectively permeable membrane
Imperimeable membrane
16474.Conversion of starch to sugar is essential for
Stomatal opening
Stomatal closing
Stoma formation
Stomatal growth
16475.Stomatal opening is based on
Exosmosis
Endosmosis
Plasmolysis in guard cells
Decrease in concentration of cell sap
16476.When the protoplasm just starts retreating from the cell wall it is known as
Plasmolysis
incepient plasmolysis
Delplasmolysis
Replasmolysis
16478.Maximum root pressure develops, when
Transpiration is low and absorption is high
Transpiration is low and absorption is low
When transpiration and absorption are low
Transpiration and absorption are high
16479.______ is precursor for abscissic acid (ABA)
water potential of soil solution is more than root hair cell sap.
Water potential of soil solution is less than root hair cell sap
Water potential both outside and inside hair is equal
Water potential value of soil solution is negative.
16480.Cohesive and adhesive force cause
Absorption of water
Continuity of water column
Discontinuity of water column
Plasmolysis
16482.DPD of flacid cell and turgid cell is ______and _____ respectively.
Maximum and Minimum
Minimum and Maximum
Zero and zero
Zero and Maximum