291.
Maximum bleeding occurs in
A
Agave
B
Vitis
C
Betula
D
Caryota urens
Answer :
Caryota urens
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292.
Apical dominance is not affected by
A
Indoleacetic acid
B
Gibberellins
C
Indoleacetaldehyde
D
Indolebutyric acid
Answer :
Gibberellins
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293.
PHytochrome occurs in two forms. It's stable from is
A
Pfr forms
B
Pr forms
C
Both forms
D
None of the above
Answer :
Both forms
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294.
Which help in maintaining form and structure of cells & soft parts of plants
A
Osmotic pressure
B
Turgor pressure
C
Atmospheric pressure
D
DPD
Answer :
Turgor pressure
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295.
The names of Yin & Tung are associated with findings of
A
Phoshorylase enzyme
B
Sugar - starch conversion
C
Localization of phosphorylase enzyme in guard cells
D
Exchange of K+ & H+
Answer :
Localization of phosphorylase enzyme in guard cells
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296.
Active and passive transports across cell membrane differ in
A
passive transport is nonselective
B
passive transport is along the concentration gradient while active transport is due to metabolic energy
C
active transport is more rapid
D
passive transport is confined to anions while active transport in confined to cations
Answer :
passive transport is along the concentration gradient while active transport is due to metabolic energy
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297.
Which of the following elements are essenial fo the photolysis of water
A
Ca and Cl
B
Mn and Cl
C
Zn and l
D
Cu and Fe
Answer :
Mn and Cl
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298.
The most important function of transpiration in plants is to cause
A
Loss of surplus water
B
Cooling of the plant
C
Rapid ascent of sap
D
Rapid rise of minerals
Answer :
Cooling of the plant
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299.
Transpiration increases when atmospheric temperature rises , due to
A
Wider opening of stomata
B
Stomatal opening becomes narrow
C
Water holding capacity of the air narrow
D
More photosynthesis in guard cells
Answer :
Water holding capacity of the air narrow
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300.
Brown heart rot of beet is due to deficiency of
A
B
B
P
C
Mg
D
Mo
Answer :
B
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