131.
Leaves of many grasses are capable of folding and unfolding because they
A
are very thin
B
are isobilateral
C
have specialised bulliform cells
D
have parallel vascular bundles
Answer :
have specialised bulliform cells
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132.
The response of different organisms to environmental rhythms of light and darkness is called
A
phototaxis
B
photoperiodism
C
phototropism
D
vernalization
Answer :
photoperiodism
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133.
Bolting hormone is
A
Auxin
B
Gibberellin
C
ABA
D
Enthylene
Answer :
Gibberellin
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134.
In short day plants, flowering is induced by
A
photoperiod less than 12 hours
B
photoperiod below a critical length and uninterrupted long night
C
long night
D
short photoperiod and interrupted long night
Answer :
photoperiod below a critical length and uninterrupted long night
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135.
Sensecence as an ative development cellular process in the growth and functioning of a flowering plant, is indicates in
A
Annulal plants
B
Floral parts
C
Vessesl and tracheid differentiation
D
Leaf abscission
Answer :
Leaf abscission
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136.
Laeral axillary buds are not allowed to grow by
A
Auxin
B
Ethylene
C
Gibberellin
D
Cytokinin
Answer :
Auxin
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137.
The pineapple which under natural conditions is difficult to blossom has been made to produce fruits throughout the year by application of
A
IAA, IBA
B
NAA, 2, 4-D
C
Phenyl acetic acid
D
Cytokinin
Answer :
NAA, 2, 4-D
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138.
Gibberelling was first extracted from
A
Fusarium moniliforme = Gibberella funjikuroi
B
Gellidium
C
Gracillaria
D
Aspergillus
Answer :
Fusarium moniliforme = Gibberella funjikuroi
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139.
Which one of the following generally acts as an antagonist to gibberellins?
A
Zeatin
B
Ethylene
C
ABA
D
IAA
Answer :
ABA
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140.
Agent orange is
A
Biodegradable insecticide
B
Dioxin weedicide
C
Biofertilizer
D
Biopesticide
Answer :
Dioxin weedicide
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