311.
Gjuard cells are found in
A
Stomata
B
Hydathodes
C
A and B both
D
None of the above
Answer :
Stomata
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312.
Roots play insignificant role in absorption of water in :
A
Pistia
B
Pea
C
Wheat
D
Sunflower
Answer :
Pistia
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313.
Root pressure is maximum , when
A
Transpiration is high and absorption is very low
B
Transpiration is very low and absorption is high
C
Absorption is very high and transpiration is also very high
D
Absorption is low and transpiration is also very low
Answer :
Transpiration is very low and absorption is high
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314.
The concept of water potential was propounded by
A
Robert mayer
B
Abbe Nollet
C
Slatyer &Tatlor
D
Levitt
Answer :
Slatyer &Tatlor
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315.
Wilting of plant is present in
A
Moss
B
Fern
C
Algae
D
Gymnosperm
Answer :
Gymnosperm
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316.
When the stomate are opening ; we observe following changes in the guard cells
A
OP increase, TP decreases
B
OP & TP increases
C
OP decreases, TP increases
D
OP& TP decreases
Answer :
OP decreases, TP increases
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317.
Water potential of a solution is always
A
+Ve
B
-Ve
C
Zero
D
Variable
Answer :
-Ve
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318.
Transpiration - cohesion - tension theory operates in
A
Active absorption
B
Passive absorption
C
Active & passive absorption
D
None of the above
Answer :
Passive absorption
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319.
Guttation is mainly due to
A
root pressure
B
osmosis
C
transpiration
D
imbibition
Answer :
root pressure
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320.
Value of water potential for pure water is
A
1
B
2
C
3
D
Zero
Answer :
Zero
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