Plant Water Relations MCQ (Multiple Choice Questions and Answers)
Q1. The membrane that allows some of solute molecules to pass through it and prevent others is called
- Permeable membrane
- Semipermeable membrane
- Selectively or differentially permeable membrane
- Impermeable membrane
Answer: 3
Q2. The external solution having more concentration then the cell sap is called
- Hypertonic solution
- Isotonic solution
- Hypotonic solution
- None of the above
Answer: 1
Q3. The external solution having same concentration as that of cell sap is called
- Hypertonic solution
- Isotonic solution
- Hypotonic solution
- Ultratonic solution
Answer: 2
Q4. The external solution having less concentration than the cell sap is called
- Hypertonic solution
- Isotonic solution
- Hypotonic solution
- Ultratonic solution
Answer: 3
Q5. The pressure exerted by the swelling protoplast on the walls of the cell is
- Wall pressure
- Osmotic pressure
- Suction pressure
- Turgor pressure
Answer: 4
Q6. The pressure exerted by wall of the cell on the protoplast is
- W.P
- T.P
- D.P
- O.P
Answer: 1
Q7. The membrane which allows the solvent molecules to pass through it and not the solute molecules is called
- Impermeable membrane
- Semipermeable membrane
- Permeable membrane
- None of the above
Answer: 2
Q8. Net movement of water is form
- Low DPD to high DPD
- High DPD to low DPD
- DPD gradient plays no role
- None of the above
Answer: 1
Q9. Cell turgidity is caused by
- Endosmosis
- Exosmosis
- Plasmolysis
- Diffusion
Answer: 1
Q10. Which helps in maintaining from and structure of cells
- Wall pressure
- Turgidity
- Atmospheric pressure
- D.P.D
Answer: 2
Q11. Fresh grapes shall shrink when they are placed in
- Hot water
- Cold water
- Starch water
- Concentrated salt solution
Answer: 4
Q12. O.P of cell can be measured by
- Manometer
- Photometer
- Calorimeter
- Plasmolysis
Answer: 4
Q13. O.P of a solution can be measured by
- Photometer
- osmometer
- Calorimeter
- Plasmolysis
Answer: 2
Q14. The common material used in demonstrating plasmolysis in the laboratory is
- Garden nasturtium
- Balsam
- Banyan
- Tradescantia
Answer: 4
Q15. A cell with fully elastic wall is placed in hypertonic solution. What will not happen
- Change in cell size and shape
- The whole cell will shrink
- Cytoplasm shrinks from the cell wall and undergoes plasmolysis
- Decries in cell size
Answer: 3
Q16. Gum swells up in the water due to
- Imbibitions
- Diffusion
- Endosmosis
- Turgidity
Answer: 1
Q17. When cell is placed in 0.25 M concentrated sugar solution, there is no change in it. So the external solution is called
- Hypertonic
- Isotonic
- Hypotonic
- None of the above
Answer: 2
Q18. When cell is placed in 0.25 M concentrated sugar solution, there is no change in it. The concentration of cell sap would be
- 0.025 M
- 0.25 M
- 25 M
- None of the above
Answer: 2
Q19. When a cell is placed im 0.5 M concentrated solution of sugar, there is no change in its volume. But if the same cell is placed in 0.5 M concentrated solution of sodium chloride there will be
- Decrease in volume
- Increase in volume
- No change in volume
- None of the above
Answer: 1
Q20. When chemical fertilizers are given to plants, the soil is to be thoroughly watered otherwise, the plants get killed because of
- Toxic effects of chemical (fertilizers) compounds
- Plasmolysis due to high concentration of fertilizers
- Failure of physiological processes like photosynthesis and respiration
- None of the above
Answer: 2
Q21. The pressure that prevails in cell due to number of substance dissolved in cell sap is
- Wall pressure
- Turgor pressure
- Osmotic pressure
- Diffusion pressure
Answer: 3
Q22. The selectively permeable membrane of the cell is
- Plasmalemma
- Cytoplasm
- Cell wall
- None of the above
Answer: 1
Q23. The plasmolysed cells regain turgidity and assume original volume under influence of hypotonic solution. The process is called
- Plasmolysis
- Deplasmolysis
- Endosmosis
- Exosmosis
Answer: 2
Q24. Diffusion pressure deficit is the amount by which two solutions differ in their
- T.P
- O.P
- D.P
- W.P
Answer: 3
Q25. In biological system, the terms osmosis involves the diffusion of
- Water
- Solutes
- Energy
- Both A and B
Answer: 1
Q26. A wooden peg inserted in a rock causes its breaking during the rainy season. It is due to development of
- Turgor pressure
- Osmotic pressure
- Matric potential
- Plasmolysis
Answer: 3
Q27. Endosmosis takes place when a plant cell is immersed in
- Isotonic solution
- Hypotonic solution
- Hypertonic solution
- HCI solution
Answer: 2
Q28. Imbibitions occurs when
- Grapes are dipped in saturated solution
- Wood is placed in ether
- Rubber is dipped in ethar
- Rubber is dipped in water
Answer: 3
Q29. A solution of 1.0 M glucose develops a pressure of -27 bars in an osmometer. What is not correct
- Pressure potential is -27 bars
- Osmotic pressure is 27 bars
- Osmotic potential is -27 bars
- Solute potential is -27 bars
Answer: 1
Q30. 1 gm molar solution is
- 1 gm mole of solute dissolved in 1000 ml of solvent
- 1 gm mole of solute dissolved in 1000 ml of solution
- 1 gm of solute dissolved in 1000 ml of solvent
- 1 gm of solute dissolved in 1000 ml of solution
Answer: 2
Q31. An animal cell placed in pure water will
- Swell up and burst
- Shrink and die
- Shrink and undergo plasmolysis
- Swell up and develop turgidity
Answer: 1
Q32. Osmotic potential of pure water is
- One
- Zero
- Less than zero
- Between zero and one
Answer: 2
Q33. A plant cell placed in water will
- Swell up and become turgid
- Swell up and burst
- Lose water and become flaccid
- Shrink and die
Answer: 1
Q34. Water potential is the sum of opposing forces of
- Osmotic pressure and diffusion pressure deficit
- Solute potential and osmotic potential
- Solute potential and pressure potential
- Diffusion pressure deficit and turgor pressure
Answer: 3
Q35. Passage of water across a selectively permeable membrane is
- Active transport
- Pinocytosis
- Facilitated diffusipon
- Osmosis
Answer: 4
Q36. Land plants grow in soils which possess an osmotic concentration
- Hypotonic in relation to cells
- Hypertonic in relations to cells
- Isotonic in relation to cells
- Ultrotonic in relation to cells
Answer: 1
Q37. What will happen when pollen grain is placed in water
- It will germinate and produce a pollen tube
- The pollen grain does not germinate
- The pollen grain swells up but bursts at places without forming a pollen tube
- The pollen grain forms a number of pollen tubes
Answer: 3
Q38. In thistle funnel experiment, entry of water into thistle funnel stops after some time automatically due to
- Diffusion of sugar out of thistle funnel
- External and internal solutions become isotonic
- Development of hydrostatic pressure in the thistle funnel
- Development of hydrostatic pressure in the beaker
Answer: 3
Q39. Seeds placed in water imbibe the same because of
- Exosmosis
- Higher ¥w
- Lower ¥ w
- Pressure of vacuoles
Answer: 3
Q40. Photometers are made on the principle that
- The amount of water transpired is approximately equal to amount of water absorbed
- The amount of water transpired is more than the amount of water absorbed
- The amount of water transpired is less than the amount of water absorbed
- Humidity causes reduction in transpiration
Answer: 1
Q41. The process in which loss of water occurs in the form of water vapour is
- Respiration
- Guttation
- Transpiration
- Exosmosis
Answer: 3
Q42. Stomatal aperture is surrounded by guard cells and widens (opens) when guard cells are
- Flaccid
- Turgid
- Bean shaped
- Dumb-bell shaped
Answer: 2
Q43. The stomata are called sunken when
- Guard cells are in the line with epidermal cells
- Guard cells are situated below epidermal cells
- Guard cells are situated above epidermal cells
- Guard cells occur in lower epidermis
Answer: 2
Q44. Transpiration is high under
- Dry environment
- Low atmospheric pressure
- High temperature
- All the above
Answer: 4
Q45. Sunken stomata
- Increase transpiration
- Decrease transpiration
- Hinder transpiration
- Stop transpiration
Answer: 2