91.
Turgidity in guard cells is controlled by A
Chloride
B
Malic acid
C
Potassium
D
Potasium chloride and malic acid
Answer :
Potasium chloride and malic acid
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92.
Conversion of starch to organic acid is essential for A
Stomatal closure
B
Stomatal opening
C
Stomatal initiation
D
Stomata growth
Answer :
Stomatal opening
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93.
When a plant cell is placed in a hypertonic solution it becomes plasmolysed what shall be be present between cell wall and plasmalemma at this stage A
Water and air
B
Cell sap
C
Hypertonic solution
D
Solutes
Answer :
Hypertonic solution
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94.
The bacterium capable of anaerobic nitrogen - fixation is A
Azatobacter
B
Rhizobium
C
Bacillus
D
Clostridium
Answer :
Clostridium
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95.
The process of osmosis involves A
Movement of solute through a semipermeable membrane
B
Movement of solvent through a semipermeable membrane
C
Movement of solution through semipermeable membrane
D
None of the above
Answer :
Movement of solvent through a semipermeable membrane
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96.
The rate of transpiration is high when A
The atmosphere is saturated with water vapour
B
Light is very dim
C
The temperature is low
D
The atmosphere is dry and the temperature is high
Answer :
The atmosphere is dry and the temperature is high
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97.
In plant water relations, ? indicates A
DPD
B
Solute potential
C
Water potential
D
Suction pressure
Answer :
Water potential
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98.
Plasma membrane controls A
Plasma membrane controls :-
B
Passage of water and solutes in and out of the cell
C
Passage of water and solutes in to the cell
D
Movement of cell contents out the cell
Answer :
Passage of water and solutes in and out of the cell
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99.
Who give the cytochrome pume theory A
Sachs
B
Lundegardh
C
Bose & Renner
D
Bennet - Clark
Answer :
Lundegardh
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100.
Mineral salts which are absorbed by the root from the soil are in the for of A
Very dilute solution
B
Dilute solution
C
Concentrated solution
D
Very concentrated solution
Answer :
Very dilute solution
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