- Pressure potential exerted by a cell vacuole is
(1) osmotic pressure
(2) turgor pressure
(3) solute potential
(4) diffusion pressure deficit - Osmotic potential of pure water is
(1) one
(2) zero
(3) less than one
(4) between zero and one - A cell is plasmolysed after being kept in hypertonic solution. What will be present between cell wall and plasma membrane ?
(1) isotonic solution
(2) hypotonic solution
(3) hypertonic solution
(4) cytoplasm - In hypertonic solution, the cell’s water potential
(1) decreases
(2) increases
(3) first increases, then decreases
(4) does’nt change - In osmosis, water always moves towards
(1) the hypotonic solution, that is, the solution with greater solute concentration
(2) the hypotonic solution, that is, the solution with lesser solute concentration
(3) the hypertonic solution, that is, the solution with greater solute concentration
(4) the hypertonic solution, that is, the solution with lesser solute concentration - The movement of water from one cell of cortex to adjacent cell in root is mainly due to
(1) accumulation of inorganic salts in cells
(2) accumulation of organic compounds in cells
(3) water potential gradient
(4) chemical potential gradient - A plant cell is placed in a solution whose solute concentration is twice as great as the concentration of the cell cytoplasm. The cell membrane is selectively permeable, allowing water but not the solutes to pass through. What will happen to the cell ?
(1) no change will occur because it is plant cell which has a rigid cell wall
(2) the cell will shrivel because of osmosis
(3) the cell will swell because of osmosis
(4) the cell will shrivel because of active transport of water - A flaccid cell is one in which
(1) cell wall is shrunken due to water deficiency
(2) cell wall is not shrunken but cell membrane has contracted
(3) cell wall is completely stretched
(4) cell wall breaks due to excessive pressure of cytoplasm - When solute is added to the solvent
(1) free energy of solvent decreases
(2) osmotic potential increases
(3) water potential decreases
(4) all these - Which one of the following statements is wrong ?
(1) water potential is the chemical potential of water
(2) solute potential is always negative
(3) water potential is equal to solute potential in a fully turgid cell
(4) pressure potential is zero in a flaccid cell - In a fully turgid cell, (Comed 08)
(1) Ψs will be negative and Ψp will be positive
(2) Ψp will be negative and Ψs will be positive
(3) both Ψs and Ψp will be positive
(4) both Ψs and Ψp will be negative - What will be the direction of net osmotic movement of water if a solution ‘A’ enclosed in a semipermeable membrane, having osmotic potential of ‘- 30 bars’ and pressure potential of ‘5 bars’ is submerged in a solution ‘B’ with osmotic potential of ‘- 10 bars’ and pressure potential ‘0’ ? (2002)
(1) A to B
(2) B to A
(3) equal movement in both the directions
(4) no movement - What will be the direction of movement of water when a solution ‘A’ having Ψw –10 bar and solution ‘B’ having Ψw –6 bar are separated by a semipermeable membrane ?
(1) A to B
(2) B to A
(3) from both ‘A’ to ‘B’ and ‘B’ to ‘A’
(4) there is no movement - A cell is placed in 0.5M solution of sugar. If no change in the volume of cell occurs, the concentration of the cell sap would be
(1) 5M
(2) 0.5M
(3) 1.0M
(4) 0.1M - Imbibition involves
(1) diffusion of water
(2) movement of water into imbibant through capillary action
(3) movement of water into imbibant through diffusion as well as capillary action
(4) absorption of water - Dry seeds when placed in water swell up due to
(1) absorption
(2) diffusion
(3) imbibition
(4) transpiration - Wooden pieces inserted in a rock cause its breakdown during rainy season due to (Comed 08)
(1) osmotic pressure
(2) turgor pressure
(3) metric potential
(4) wall pressure - A RBC and a plant cell are placed in distilled water. The solute concentration is the same in both the cells. What changes would be observed in them ? (CET 09)
(1) Both plant cell and RBC would not undergo any change
(2) The RBC would increase in size and burst while the plant cell would remain about the same size
(3) The plant cell would increase in size and burst while the RBC would remain about the same size
(4) Both plant cell and RBC would decrease in size and collapse - Which of the following type of water is not available to plants for absorption ?
(1) hygroscopic water & capillary water
(2) capillary water & gravitational water
(3) gravitational water & hygroscopic water
(4) capillary water only - Many transplanted seedlings may not survive because (2000)
(1) they donot like the new soil
(2) they donot get the required mineral salts
(3) leaves get damaged during transfer
(4) most of the roothairs are lost during transplantation - The correct route of water in a plant is
(1) passage cell of endodermis – xylem – cortex – root hair
(2) cortex – root hair – xylem – passage cells of endodermis
(3) root hair – cortex – passage cell of endodermis – xylem
(4) xylem – passage cell of endodermis – cortex – root hair - Identify the correct statement;
(1) hypotonic medium triggers increased water absorption by root hairs
(2) capillary water is held tightly by the soil particles
(3) the initial stage of water absorption is by osmosis
(4) a cell’s water potential decreases in hypotonic solution - Root cap has no role in water absorption because it has
(1) no cells containing chloroplasts
(2) no direct connection with vascular bundles
(3) no root hairs
(4) loosely arranged cells - A correct statement among the following is
(1) the apoplastic movement of water occurs exclusively through the intercellular spaces and the walls of cells
(2) movement through apoplast involves crossing the cell membrane
(3) apoplastic transport does not depend on gradient
(4) apoplast provides many barriers to water movement - Which of the following would not be present in significant amounts in the xylem sap ?
(1) nitrogen
(2) sugar
(3) phosphorous
(4) water - Water vapour in woody plants are removed through
(1) stomata
(2) lenticels
(3) stomata and lenticels
(4) lenticels and hydathodes - What is the main force responsible for the upward movement of water in the trunk of a tree ?
(1) evaporation of water from leaf surface
(2) breakdown and release of energy of sugar molecules
(3) pressure exerted by the root cells
(4) osmotic changes caused by alterations in salt content - Which of the following statement/s is/are true ?
(1) the apoplastic movement of water occurs through the cell wall without crossing any membranes
(2) the symplastic movement of water occurs from cell to cell through the plasmodesmata
(3) water potential of the cell increases as the concentration of solutes in it increases
(4) cell to cell movement of water occurs from lower water potential to higher water potential
(1) 2 only
(2) 1 and 2 only
(3) 1, 2 and 3 only
(4) 2, 3 and 4 only - Root hairs absorb bulk of water from soil when
(1) osmotic concentration is same in the two
(2) solute concentration is higher in soil solution
(3) solute concentration is lower in root hairs
(4) solute concentration is higher in root hairs - What keeps the force of gravity from pulling water molecules out of leaves ?
(1) upward pressure from leaves
(2) high water pressure in the leaves
(3) movement of water towards a sugar sink
(4) cohesion and adhesion of water molecules - Which factor would contribute the most to increasing the rate of water movement upward in xylem ?
(1) generation of root pressure
(2) availability of soil water
(3) rate of transpiration from leaves
(4) rate of carbohydrate loading - A common feature shared by guard cells and mesophyll cells is (2002)
(1) differentially thick cell wall
(2) uniformly thin cell wall
(3) presence of chloroplasts
(4) dumbell shaped structure - High humidity during rains directly affects the following physiological function of flowering plants
(1) photosynthesis
(2) transpiration
(3) metabolism
(4) respiration - Transpiration facilitates
(1) excretion of minerals
(2) electrolyte balance
(3) absorption of water
(4) opening of stomata - If transpiration is low and absorption is high, then
(1) leaves will wilt
(2) mesophyll cell will die
(3) photosynthesis is disturbed
(4) root pressure becomes maximum - Which of the following changes in the cell sap of guard cells leads to events responsible for opening of the stomata during day time ?
(1) decrease in ψs but increase in ψp
(2) increase in ψs but decrease in ψp
(3) increase in both ψs and ψp
(4) decrease in both ψs and ψp - Stoma opens when (CET 09)
(1) guard cells swell due to an increase in their water potential
(2) guard cells swell by endosmosis due to the influx of hydrogen ions (protons)
(3) guard cells swell by endosmosis due to efflux of potassium ions
(4) guard cells swell due to a decrease in their water potential - ………… is the enzyme responsible for stomatal movement. (Comed 07)
(1) pyruvic kinase
(2) cytochrome oxidase
(3) PEP carboxylase
(4) RUBISCO - Which of the following would ultimately trigger opening of stomata ?
(1) extreme heat
(2) loss of K+ by guard cells
(3) nightfall
(4) swelling of guard cells due to osmosis - What will be the effect of accumulation of K+ in guard cells ?
(1) water potential increases
(2) water potential decreases
(3) turgidity is lost
(4) exosmosis occurs - A sudden increase in CO2 concentration around a leaf will cause
(1) wider opening of stomata
(2) decrease in transpiration due to stomatal closure
(3) increase in rate of transpiration
(4) increase in the rate of absorption of water by roots - Stomata open when guard cells have
(1) more K+
(2) Less K+
(3) More Cl-
(4) More ABA - Which of the following is true ?
(1) ABA stimulates the opening of stomata
(2) ABA and cytokinin have no effect on stomatal movement
(3) ABA stimulates the opening of stomata and cytokinin stimulates the closure of stomata
(4) ABA stimulates the closure of stomata and cytokinin stimulates the opening of stomata - Transpiration differs from evaporation chiefly in
(1) rate of water loss
(2) that transpiration is a physiological process while evaporation is a physical process
(3) transpiration is a physical process while evaporation is a physiological process
(4) frequency of water loss - Transpiration in plants would be most rapid when
(1) atmosphere is saturated with water
(2) there is excess of water in the soil
(3) the air is still
(4) environmental conditions are dry - Identify the correct statement;
(1) ABA is produced during water stress which causes closure of stomata
(2) the stomata of water lily opens at night
(3) stomatal closure is facilitated by conversion of starch into organic acids
(4) the outer wall of guard cells is suberised - Transpiration rate in sunflower leaf is
(1) higher on the upper surface
(2) higher on the lower surface
(3) equal on both the surfaces
(4) lower on the lower surface - In which of the following plants, there will be no transpiration ? (2005)
(1) aquatic submerged plants
(2) plants living in deserts
(3) aquatic plants with floating leaves
(4) plants growing in hilly regions - Which of these reduces rate of transpiration ?
(1) rise in temperature
(2) increase in water uptake
(3) increase in wind velocity
(4) decrease in light intensity - Match the type of stomatal distribution listed under column I and the surface on which stomata are present, given under column II.
Column I Column II
A. Potamogeton type p. Stomata only on upper surface
B. Oat or Oak type q. Stomata on only lower surface
C. Water lily type r. Stomata are vestigeal or absent
D. Apple type s. More stomata on lower surface
t. Equal distribution of stomata on the two surfaces
(1) A = r, B = t, C = p, D = q
(2) A = r, B = p, C = s, D = q
(3) A = s, B = r, C = q, D = p
(4) A = r, B = t, C = s, D = q - Match the type of stomatal rhythm listed under column I and the daily stomatal rhythm exhibited by them, given under column II.
Column I Column II
A. Alfalfa type p. Stomata remain closed throughout
B. Potato type q. Stomata remain open throughout
C. Barley type r. Stomata remain open throughout except
for a few hours in the evening
s. Stomata remain closed throughout except
for a few hours in the day time
(a) A-q, B-r, C-s
(b) A-r, B-s, C-q
(c) A-q, B-r, C-p
(d) A-q, B-S, C-p - Guttation occurs when
(1) transpiration is very low and absorption is very high
(2) transpiration and absorption are very high
(3) transpiration and absorption are very low
(4) transpiration is very high and absorption is very low - Which of the following physical processes is involved chiefly in causing guttation ?
(1) cohesive force
(2) osmosis
(3) root pressure
(4) transpiration pull - The achlorophyllous, loosely arranged parenchyma cells present at the tip of tracheary elements below hydathodes constitute
(1) complementary tissue
(2) epiblema
(3) epithem
(4) passage cells - Which would do maximum harm to a tree ? (CET 07)
(1) loss of half of its leaves
(2) loss of all its bark
(3) loss of all its leaves
(4) loss of half of its branches - Which of the following is a difference between transport by xylem and transport by phloem ?
(1) active transport moves xylem sap but not phloem sap
(2) transpiration moves phloem sap but not xylem sap
(3) xylem sap moves up whereas phloem sap moves up and down
(4) xylem sap moves from sugar source to sink, but phloem sap does not - Although a girdled tree (upto bast) may survive for sometime, it will eventually die because
(1) water will not move upwards
(2) water will not move downwards
(3) sugars and other organic materials will not move downwards
(4) sugars and other organic materials will not move upwards
Thursday, October 1, 2009
FEW QUESTIONS FOR CET IN PLANT WATER RELATIONS
Subscribe to:
Post Comments (Atom)
wonder full work sir we r actually very much benefited by u r blog sir
ReplyDelete