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Quiz 12
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Q.1
Water potential is maximum in case of ... .... [ JKCMEE 2003]
0%
a) Pure water
0%
b) 2% glucose
0%
c) 10% glucose
0%
d) 10% NaCl
Explanation
Water potential of water is maximum which is zero. All other solutions have water potential in negative values Answer : (a)
Q.2
Changes in turgidity of guard cells are controlled by .... .... [ MPPMT 2001]
0%
a) Potassium
0%
b) Chloride
0%
c) Malic acid
0%
d) All the above
Explanation
Turgidity of guard cells are controlled by potassium, chloride and malic acid. Answer : (d)
Q.3
Which of the following is done during ringing experiment ... ...[ CPMT 2010]
0%
a) Bark is removed
0%
b) Xylem is removed
0%
c) Pith is removed
0%
d) All the above
Explanation
ringing experiment. a procedure in which the outer tissues of a stem are removed, leaving only the xylem and pith intact. Water transport up the stem is unimpeded by such a process, whereas food transport down from the leaves stops at the ring, thus demonstrating the roles of XYLEM and PHLOEM respectively Answer : (a)
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]
0%
a) Potometer, manometer, porometer, osmometer
0%
b) Manometer, potometer, porometer, osmometer
0%
c) Porometer, manometer, potometer, osmometer
0%
d) Potometer, porometer, manometer, osmometer
Explanation
Transpiration - Potometer Size of stomata - Porometer Atmospheric pressure - Manometer Osmosis - Osmometer Answer : (d)
Q.5
Root pressure is unable to explain the ascent of sap because it is not found in ....
0%
a) Bryophytes
0%
b) All plants in all seasons
0%
c) Trees
0%
d) Spring
Explanation
The ascent of sap also occurs in plants without roots and root pressure. Answer : (b)
Q.6
High CO2 concentration in leaf interior will cause ... ... [ CPMT 1995]
0%
a) Stomatal opening
0%
b) Stomatal closure
0%
c) No effect on stomata
0%
d) Stomata are destroyed
Explanation
High CO2 concentration in leaf interior will cause Stomatal closure Answer : (b)
Q.7
Root pressure may be caused by .... ...
0%
a) Osmotic flow of water into xylem of absorbing part of root
0%
b) Loss of water from xylem of the plant due to transpiration
0%
c) Low water potential of leaves
0%
d) High water potential of leaves
Explanation
Root pressure may be caused by Osmotic flow of water into xylem of absorbing part of root Answer : (a)
Q.8
Rate of transpiration is reduced with ... ... [ MPPMT 1999 ]
0%
a) Rise in temperature
0%
b) Decrease in light intensity
0%
c) Increase in wind velocity
0%
d) Increase in water uptake
Explanation
Rate of transpiration is reduced with Decrease in light intensity Answer : (b)
Q.9
Stomata open in daytime due to .... ... [ Wardha 2005]
0%
a) Decrease in pH
0%
b) Decrease in water potential
0%
c) Increase in water potential
0%
d) Light
Explanation
Answer : (b)
Q.10
Raisins placed in water swell up due to .... ... [ KCET 2008]
0%
a) plasmolysis
0%
b) Adsorption
0%
c) Diffusion
0%
d) Endosmosis
Explanation
Answer : (d)
Q.11
Stomata close in response to ... .... [ AMU 2003]
0%
a) Hot dry weather
0%
b) Abscisic acid
0%
c) Cytokinin
0%
d) Both a and b
Explanation
Answer : (d)
Q.12
Each stoma is surrounded by ... ...[ Har PMT 2005]
0%
a) Passage cells
0%
b) Guard cells
0%
c) Parenchyma cells
0%
d) Lenticels
Explanation
Answer : (b)
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
0%
a) Z, Y, X
0%
b) X, Y, Z
0%
c) Y, X, Z
0%
d) Y, Z, X
Explanation
Stomatal index is the percentage which the number of stomata forms to the total number of epidermal cells, each stomata being counted as one cell. Stomatal index (I) can be calculated by using following equation. I = Stomatal index, S = No. of stomata per unit area, E = No. of epidermal cells in the same unit area. USing above formula Stomatal index of x is 16.66 Stomatal index of y is 20.00 Stomatal index of z is 18.36 Now decreasing order of Stomatal index will be y > z> x Answer : (d)
Q.14
Water supply in the plant is due to ... ...[ CPMT 1996]
0%
a) Osmosis
0%
b) Guttation
0%
c) Cohesion force
0%
d) Imbibition
Explanation
Answer:(c)
Q.15
The girdling or ringing experiment is that ... ...
0%
a) The metallic ring is tightly tied to a stem
0%
b) The ring of tissue external to xylem is removed in a stem
0%
c) The area is simply marked in the form of ring in a stem
0%
d) None of the above
Explanation
Answer : (b)
Q.16
Water potential of a solution is depicted by ... .... [ AIIMS 1996]
0%
a) ψp
0%
b) ψs
0%
c) ψx
0%
d) Δψ
Explanation
Answer:(b)
Q.17
Ascent of sap is ... ..
0%
a) Upward movement of water in the plant
0%
b) Downward movement of organic nutrients
0%
c) Upward and downward movement of water in the plant
0%
d) Redistribution of inorganic substances in the plants
Explanation
Answer : (a)
Q.18
In thin-leaved mesophytes, stomata open during the day and closed during the night. They belong to ... ...[ CPMT 1991]
0%
a) Barley type
0%
b) Potato type
0%
c) Alfalfa type
0%
d) Bean type
Explanation
Answer : (c)
Q.19
Two solutions with the same osmolarity are ... ... [ JKCMEE 2005]
0%
a) Isotonic
0%
b) Hypertonic
0%
c) Hypotonic
0%
d) None of the above
Explanation
Answer : (a)
Q.20
Water potential is equal to .... ... [ AMU 1997]
0%
a) ψs + O.P.
0%
b) ψs = T.P.
0%
c) ψp + psiw
0%
d) ψs + ψp
Explanation
Answer : (d)
Q.21
Presence of moisture in the atmosphere ... ... [ CPMT 2003]
0%
a) Increases rate of transpiration
0%
b) Decreases rate of transpiration
0%
c) Does not affect rate of transpiration
0%
d) Transpiration becomes rapid
Explanation
Answer : (b)
Q.22
Guttation is due to ... ...[ CBSE 2011]
0%
a) Negative root pressure
0%
b) Positive root pressure
0%
c) Transpiration
0%
d) None of the above
Explanation
Answer : (b)
Q.23
Bacteria cannot survive in highly salted pickle because ... ... [ Manipur 2009]
0%
a) Salt inhibits reproduction of bacteria
0%
b) They become plasmolysed and die
0%
c) Nutrients in it cannot support life
0%
d) Enough light is not available for photosynthesis
Explanation
Answer : (b)
Q.24
Plant cells dipped in distilled water will become .... ...[ MPPMT 1998]
0%
a) Turgid
0%
b) Plasmolysed
0%
c) Flaccid
0%
d) Impermeable
Explanation
Answer : (a)
Q.25
Imbibition theory was given by ... ..
0%
a) Sachs
0%
b) Boehm
0%
c) Scholander
0%
d) Curtis
Explanation
Answer : (a)
Q.26
Endosmosis of water occurs when water potential of the cell sap is ... ... [ AMU 1996]
0%
a) Higher
0%
b) Equal
0%
c) Lower
0%
d) None of the above
Explanation
Answer : (c)
Q.27
Compared to 1M sucrose solution, the ψw of 1M sodium chloride solution is ... ...
0%
a) High
0%
b) Same
0%
c) Lower
0%
d) None of the above
Explanation
Answer : (c)
Q.28
An adaptation to reduce transpiration is ... ... [ manipal 2003]
0%
a) Spongy parenchyma
0%
b) High osmotic pressure
0%
c) Hydathodes
0%
d) Aerenchyma
Explanation
Answer : (b)
Q.29
Nonfunctional stomata can be seen in .... ..[ Pb PMT 1998]
0%
a) Mango leaf
0%
b) Pea leaves
0%
c) Hydrilla
0%
d) Lotous
Explanation
Answer : (c)
Q.30
Which ones regulate stomatal movements ... ... a) IAA b) GS3 c) Zeatin d) ABA
0%
a) a, c
0%
b) b, c
0%
c) c, d
0%
d) b, d
Explanation
Answer : (c)
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