CBSE Questions for Class 11 Medical Biology Transport In Plants Quiz 3 - MCQExams.com

Glucose is not stored in plant due to
  • Decrease in osmotic pressure
  • Increase in osmotic pressure
  • Increase in turgor pressure
  • Decrease in turgor pressure
When osmotic pressure becomes equal to the wall pressure, then
  • The flow of water will be inside the cell.
  • The flow of water will be outside the cell.
  • Both flow will occur inside as well as outside.
  • There will be no flow.
Water is necessary 
  • Reagent
  • Content of protoplasm
  • Solvent
  • All of the above
Identify the correct relationship with reference to water potential of a plant cell.
  • $$\psi _{w}=\psi _{m}+\psi _{s}+\psi _{p}$$
  • $$\psi _{w}=\psi _{m}+(\psi _{s}-\psi _{p})$$
  • $$\psi _{w}=\psi _{m}-(\psi _{s}+\psi _{p})$$
  • $$\psi _{w}=\psi _{m}-\psi _{s}-\psi _{p}$$
The potential energy of water is referred to as
  • Water potential
  • Osmotic potential
  • Gravity potential
  • Pressure potential
Water potential $$\Psi $$ measured in bar or in
  • $$Ib/in^{2}$$
  • mm of Hg
  • atm
  • All of the above
What will be the direction of movement of water, when a solution A having water potential of - 9bars and another solution B of - 4bars is separated by a semipermeable membrane?
  • B to A
  • A to B
  • Both direction
  • None of the above
Osmotic pressure of a solution is
  • Greater than pure solvent
  • Less than pure solvent
  • Equal to pure solvent
  • Less than or greater than pure solvent
The water potential and osmotic potential of pure water are
  • 100 and 0
  • 0 and 0
  • 100 and 200
  • 0 and 100
Water potential can be obtained by
  • OP + TP
  • OP $$=$$ WP
  • P + $$\pi$$
  • OP - DPD
The movement of water from one cell of the cortex to the adjacent one in root is due to
  • Accumulation of inorganic salts in the cells
  • Accumulation of organic compounds in the cells
  • Chemical potential gradient
  • Water potential gradient
When the concentration of the solutes in the soil is low, the absorption of water ?
  • Remains normal
  • Will stop
  • Will increase
  • Will decrease
When a cell is fully turgid, which of the following will be zero?
  • Wall pressure
  • Osmotic pressure
  • Turgor pressure
  • Water potential
Which of the following statement(s) is/are true?
  • The apoplastic movement of water occurs exclusively through the cell wall without crossing any membranes.
  • Solutes present in a cell (or in any solution) increase the free energy of water or water potential.
  • The symplastic movements occurs from cell to cell through the plasmodesmata.
  • Membrane permeability depends on the membrane composition, as well as the chemical nature of the solute.
If a cell is placed in a hypertonic solution then $$\Psi_{w}$$ of the cell will be
  • Increased
  • Decreased
  • Unchanged
  • First increases then decreases
Exudation of xylem sap is due to
  • Passive adsorption
  • Root pressure
  • Guttation
  • Presence of transpiration
Cell A has osmotic potential of -18 bars and pressure potential of 8 bars whereas, cell b has osmotic potential of -14bars and pressure potential 2 bars, the direction of flow of water will be
  • From cell B to cell A
  • From cell A to cell B
  • No flow of water
  • In both the direction
Apoplastic movement of water in plants occurs on the outer side of
  • Casparian strips
  • Plasma membrane
  • Plasmodesmata
  • None of the above
Movement of H$$_2$$O through cell wall and intercellular spaces is called
  • Apoplast
  • Symplast
  • Tonoplast
  • None of the above
In plants, water supply is due to
  • Osmosis
  • Imbibition
  • Guttation
  • Adhesion force
Addition of a solute to pure water causes
  • Negative water potential
  • More negative water potential
  • Positive water potential
  • More positive water potential
In which of the following the rate of transpiration is high
  • CAM plants
  • $$C_{3}$$ plants
  • $$C_{3}$$ and $$C_{4}$$ plants
  • $$C_{4}$$ plants
When a plant is girdled
  • The root dies first
  • The shoot dies first
  • The root and shoot die at the same time
  • Neither the root nor the shoot will die
The shoot pressure is measured by
  • Bomb calorimeter
  • Luxmeter
  • Pressure bomb technique
  • None of the above
Root pressure is maximum when
  • Transpiration is high and absorption is very low
  • Transpiration is very low and absorption is high
  • Transpiration is very high and absorption is also high
  • Transpiration and absorption both are slow
Who has used two bulbs of semipermeable membrane to explain pressure flow theory?
  • Munch
  • Jones
  • Spanner
  • Fenson
The cytoplasm of surrounding cells remain connected through each other by plasmodesmata, this continuity is called
  • Symplast
  • Protoplast
  • Desmoplast
  • All of the above
Munch hypothesis is based on
  • Translocation of food due to turgor pressure (TP) gradient and imbibition force
  • Translocation of food due to turgor pressure (TP) gradient
  • Translocation of food due to imbibition force
  • None of the above
Food is transported to various parts of the plant through
  • Root hairs
  • Phloem
  • Xylem
  • Stomata
First step of influx of water into a plant is
  • Osmosis
  • Imbibition
  • Absorption
  • Suction
Plant tissues, which are actively growing have water content of
  • 40 - 50%
  • 65 - 75%
  • 20 - 40%
  • 85 - 95%
The casparian strips of root endoderm contain a mixture of
  • Cellulose and cutin
  • Cellulose and lignin
  • Lignin and suberin
  • Cellulose and suberin
Water secreting glands or tissues are known as
  • Tyloses
  • Hydathodes
  • Cork
  • Phellogen
Guttation only occurs in
  • Hydrophytes
  • Mesophytic herbs
  • Mangroves
  • Marshy plant
Which statement is wrong?
  • Plant take very little amount of minerals element from soil
  • Plant absorb one thing at a time either water or minerals salt
  • Root hair absorb water and minerals together
  • Minerals absorption primarily takes place by active method
Imbibition process involves
  • Both diffusion and capillary action
  • Only diffusion
  • Only capillary action
  • None of the above
Minerals salts which are absorbed by the root from soil are in the form of
  • Very dilute solution
  • Dilute solution
  • Concentrated solution
  • Very concentrated solution
The water soluble materials pass through the proteins called __________.
  • Glycoprotein
  • Glycocalyx
  • Extrinsic proteins
  • Channel proteins
If the amount of an ion absorbed by a root hair cell at $$0^{0}C$$ is 5 gm and at $$20^{0}C$$ is 20 gm. The amount of this ion absorbed actively should be
  • 25 gm
  • 20 gm
  • 15 gm
  • 5 gm
Following are the few definitions of osmosis. Read carefully and select the incorrect definition.
  • Movement of solute molecules from a lower concentration of water to a higher concentration of solution through a semipermeable membrane.
  • Movement of solvent molecules from lower solute concentration to higher solute concentration.
  • Movement of solute molecules from higher concentration to lower concentration of solution through a permeable membrane.
  • All of the above.
The process of transpiration in plants helps in the
  • Opening of stomata
  • Closing of stomata
  • Upward conduction of water and minerals
  • Both B and C
Which of the following is formed during respiration in plant?
  • $$O_{2}$$
  • $$CO_{2}$$
  • $$NO_{2}$$
  • $$SO_{2}$$
Plasmolysis in a plant cell is defined as
  • Break down (lysis) of plasma membrane in hypotonic medium
  • Shrinkage of cytoplasm in hypertonic medium
  • Shrinkage of nucleoplasm
  • None of the above
Choose the best definition for 'diffusion' from the following.
  • Passive movement from an area of greater concentration to one of lesser concentration.
  • Active movement from an area of greater concentration to one of lesser concentration.
  • Passive movement from an area of lesser concentration to one of greater concentration.
  • Active movement from an area of lesser concentration to one of greater concentration.
Leaves of annual plants obtain $$O_{2}$$ through
  • Cell walls
  • Cuticle and leaf scars
  • Stomata
  • Lenticles
Following are a few definitions of osmosis. Read carefully and select the correct definition.
  • Movement of water molecules from a region of higher concentration to a region of lower concentration through a semipermeable membrane.
  • Movement of solvent molecules from its higher concentration to lower concentration.
  • Movement of solvent molecules from higher concentration to lower concentration of solution through a permeable membrane.
  • Movement of solute molecules from lower concentration to the higher concentration of solution through a semipermeable membrane.
In photosynthesis, oxygen is given out by the process of
  • Diffusion 
  • Osmosis
  • Transpiration
  • None of the above
Professor K.C. Mehta is known for his contribution in the field of
  • Bryology
  • Plant physiology
  • Virology
  • Plant pathology
Which of the following statement is correct?
  • Osmosis occurs due to movement of solute particles through the semipermeable membrane.
  • Osmosis occurs both in plant cells and animal cells.
  • Osmosis is a kind of diffusion of solvent molecules through the semipermeable membrane.
  • Both B and C.
Imbibition is a
  • Property of solvent
  • Capillary phenomenon
  • Protoplasmic phenomenon
  • Property of solutes
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