Q.1
Water potential is maximum in case of ... .... [ JKCMEE 2003]
  • a) Pure water
  • b) 2% glucose
  • c) 10% glucose
  • d) 10% NaCl
Q.2
Changes in turgidity of guard cells are controlled by .... .... [ MPPMT 2001]
  • a) Potassium
  • b) Chloride
  • c) Malic acid
  • d) All the above
Q.3
Which of the following is done during ringing experiment ... ...[ CPMT 2010]
  • a) Bark is removed
  • b) Xylem is removed
  • c) Pith is removed
  • d) All the above
Q.4
Find the correct order for instrument used for measuring (i) Transpiration (ii) Size of stomata (iii) Atmospheric pressure (iv) Osmosis .... [ Har PMT 2002]
  • a) Potometer, manometer, porometer, osmometer
  • b) Manometer, potometer, porometer, osmometer
  • c) Porometer, manometer, potometer, osmometer
  • d) Potometer, porometer, manometer, osmometer
Q.5
Root pressure is unable to explain the ascent of sap because it is not found in ....
  • a) Bryophytes
  • b) All plants in all seasons
  • c) Trees
  • d) Spring
Q.6
High CO2 concentration in leaf interior will cause ... ... [ CPMT 1995]
  • a) Stomatal opening
  • b) Stomatal closure
  • c) No effect on stomata
  • d) Stomata are destroyed
Q.7
Root pressure may be caused by .... ...
  • a) Osmotic flow of water into xylem of absorbing part of root
  • b) Loss of water from xylem of the plant due to transpiration
  • c) Low water potential of leaves
  • d) High water potential of leaves
Q.8
Rate of transpiration is reduced with ... ... [ MPPMT 1999 ]
  • a) Rise in temperature
  • b) Decrease in light intensity
  • c) Increase in wind velocity
  • d) Increase in water uptake
Q.9
Stomata open in daytime due to .... ... [ Wardha 2005]
  • a) Decrease in pH
  • b) Decrease in water potential
  • c) Increase in water potential
  • d) Light
Q.10
Raisins placed in water swell up due to .... ... [ KCET 2008]
  • a) plasmolysis
  • b) Adsorption
  • c) Diffusion
  • d) Endosmosis
Q.11
Stomata close in response to ... .... [ AMU 2003]
  • a) Hot dry weather
  • b) Abscisic acid
  • c) Cytokinin
  • d) Both a and b
Q.12
Each stoma is surrounded by ... ...[ Har PMT 2005]
  • a) Passage cells
  • b) Guard cells
  • c) Parenchyma cells
  • d) Lenticels
Q.13
Number of stomata and epidermal cells/mm2 of lower epidermis of X, Y and Z plants are as follows. Arrange them in decreasing order of their stomatal index .... [EAMCET 2009]
Plant Stomata Epidermal Cells
X 30 150
Y 60 240
Z 90 400
  • a) Z, Y, X
  • b) X, Y, Z
  • c) Y, X, Z
  • d) Y, Z, X
Q.14
Water supply in the plant is due to ... ...[ CPMT 1996]
  • a) Osmosis
  • b) Guttation
  • c) Cohesion force
  • d) Imbibition
Q.15
The girdling or ringing experiment is that ... ...
  • a) The metallic ring is tightly tied to a stem
  • b) The ring of tissue external to xylem is removed in a stem
  • c) The area is simply marked in the form of ring in a stem
  • d) None of the above
Q.16
Water potential of a solution is depicted by ... .... [ AIIMS 1996]
  • a) ψp
  • b) ψs
  • c) ψx
  • d) Δψ
Q.17
Ascent of sap is ... ..
  • a) Upward movement of water in the plant
  • b) Downward movement of organic nutrients
  • c) Upward and downward movement of water in the plant
  • d) Redistribution of inorganic substances in the plants
Q.18
In thin-leaved mesophytes, stomata open during the day and closed during the night. They belong to ... ...[ CPMT 1991]
  • a) Barley type
  • b) Potato type
  • c) Alfalfa type
  • d) Bean type
Q.19
Two solutions with the same osmolarity are ... ... [ JKCMEE 2005]
  • a) Isotonic
  • b) Hypertonic
  • c) Hypotonic
  • d) None of the above
Q.20
Water potential is equal to .... ... [ AMU 1997]
  • a) ψs + O.P.
  • b) ψs = T.P.
  • c) ψp + psiw
  • d) ψs + ψp
Q.21
Presence of moisture in the atmosphere ... ... [ CPMT 2003]
  • a) Increases rate of transpiration
  • b) Decreases rate of transpiration
  • c) Does not affect rate of transpiration
  • d) Transpiration becomes rapid
Q.22
Guttation is due to ... ...[ CBSE 2011]
  • a) Negative root pressure
  • b) Positive root pressure
  • c) Transpiration
  • d) None of the above
Q.23
Bacteria cannot survive in highly salted pickle because ... ... [ Manipur 2009]
  • a) Salt inhibits reproduction of bacteria
  • b) They become plasmolysed and die
  • c) Nutrients in it cannot support life
  • d) Enough light is not available for photosynthesis
Q.24
Plant cells dipped in distilled water will become .... ...[ MPPMT 1998]
  • a) Turgid
  • b) Plasmolysed
  • c) Flaccid
  • d) Impermeable
Q.25
Imbibition theory was given by ... ..
  • a) Sachs
  • b) Boehm
  • c) Scholander
  • d) Curtis
Q.26
Endosmosis of water occurs when water potential of the cell sap is ... ... [ AMU 1996]
  • a) Higher
  • b) Equal
  • c) Lower
  • d) None of the above
Q.27
Compared to 1M sucrose solution, the ψw of 1M sodium chloride solution is ... ...
  • a) High
  • b) Same
  • c) Lower
  • d) None of the above
Q.28
An adaptation to reduce transpiration is ... ... [ manipal 2003]
  • a) Spongy parenchyma
  • b) High osmotic pressure
  • c) Hydathodes
  • d) Aerenchyma
Q.29
Nonfunctional stomata can be seen in .... ..[ Pb PMT 1998]
  • a) Mango leaf
  • b) Pea leaves
  • c) Hydrilla
  • d) Lotous
Q.30
Which ones regulate stomatal movements ... ... a) IAA b) GS3 c) Zeatin d) ABA
  • a) a, c
  • b) b, c
  • c) c, d
  • d) b, d
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