431.
In the mechanism of opening of stomata, the important factor is
A
Turgidity of the guard cells
B
Chlorophyll content of the guaed cells
C
Hormone content of the subsidiary cells
D
Protein content of the epidermal cells
Answer :
Turgidity of the guard cells
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432.
Stomata open at day because in day the guard cells have
A
To help gas exchange
B
A low pH
C
Ahigh level of sugar , organic acid ATP & K+ ion
D
Unequally thickened walls
Answer :
Ahigh level of sugar , organic acid ATP & K+ ion
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433.
A small mesophytic twig with green leaves is dipped in to water in a big beaker under sunlight . It demonstrates
A
Photosyntheesis
B
Repiration
C
Transpiration
D
None of the above
Answer :
Transpiration
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434.
Before opening of stomata accumulation of the following ion is seen in
A
PO4
B
K+
C
Mg++
D
Na+
Answer :
K+
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435.
Increase in CO2 concentration around leaf results in
A
Rapid opening of stomata
B
Partial closure of stomata
C
Complete closure of stomata
D
No effect on stomatal opening
Answer :
Partial closure of stomata
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436.
During rainy season wooden doors generally swell up due to
A
Osmosis
B
Imbibition
C
Bad workmanship
D
Wood quality
Answer :
Imbibition
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437.
When a plant cell is placed in a hypotonis solution. Which of the following will not apply
A
Wall pressure is decreased
B
The cell become turgid
C
Suction pressure of the cell sap willdecrease
D
Water potential of the cell sap will increase
Answer :
Wall pressure is decreased
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438.
Active K+ ⇄ H+ exchange theory explained
A
Ascent of sap
B
Phloem conduction
C
Ion abskorption
D
Stomatal movement
Answer :
Stomatal movement
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439.
Which pigment regulates opening and closing of stomata
A
Chlorophylls
B
Carotenoids
C
Plytochrome
D
Flavines
Answer :
Plytochrome
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440.
Seeds swell when placed in water due to
A
Osmosis
B
Imbibition
C
Hydrolysis
D
All of the above
Answer :
Imbibition
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