81.
Wilting of a plant result from excessive
A
Water molecules enter adjacent guard cells
B
Atmosphere outside stomata become less humid
C
Auxins are accumulated in guard cells
D
Salt molecules are excreted by adjacent guared cells
Answer :
Water molecules enter adjacent guard cells
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82.
Which is essential for N2 metabolism
A
B
B
Mo
C
Cu
D
Mg
Answer :
Mo
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83.
When the solute has been added to the solution ; it water potential will
A
Increases
B
Decreases
C
Remain unchanged
D
First increases then decreases
Answer :
Decreases
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84.
When grapes are placed in water, then which process occurs
A
Plasmolysis
B
Exosmosis
C
Endosmosis
D
None of the above
Answer :
Endosmosis
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85.
Carrier protein helped in
A
Active absorption of ions
B
Passive ions absorption
C
Water absorption
D
Vaporization
Answer :
Active absorption of ions
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86.
Ethylene is used for
A
Decrease the senescence
B
Increase the heights of stem
C
Ripening of fruits
D
Prevention of leaf fall
Answer :
Ripening of fruits
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87.
Which pigment is responsible for flowering in plant
A
Phytochrome
B
Cytochrome
C
Anthocyanin
D
Xanthophyll
Answer :
Phytochrome
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88.
Movement of ions or molecules in a direction opposite to that of prevailing electrochemical gradient is known as
A
diffusion
B
active transport
C
pinocytosis
D
brownian movement
Answer :
active transport
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89.
If a cell is reduced in size (Shrinks ) of placing in a solution of sugar , the solution is
A
Hypertonic
B
Hypotonic
C
Isotonic
D
None of the above
Answer :
Hypertonic
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90.
Cobalt present in
A
Vit,-A
B
Vit.-B2
C
Vit,-B12
D
PC
Answer :
Vit,-B12
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