151.
Physiologically active from of phytochrome is
A
P730
B
P660
C
P700
D
P680
Answer :
P730
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152.
Through their effect on plant growth regulators, what do the temperature and light control in the plants?
A
Apical dominance
B
Flowering
C
Closure of stomata
D
Fruit elongation
Answer :
Flowering
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153.
Seeds of Tomato do not germinate in its pulp due to
A
Presence of excess salts
B
Presence of ferulic acid
C
Absence of oxygen
D
Presnece of ABA
Answer :
Presence of ferulic acid
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154.
Phytochrome is involved in
A
phototropism
B
photorespiration
C
photoperiodism
D
geotropism
Answer :
photoperiodism
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155.
Gibberellins promote
A
seed germination
B
seed dormancy
C
leaf fall
D
root elongation
Answer :
seed germination
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156.
Which is employed for artificial ripening of banana fruits?
A
Auxin
B
Coumarin
C
Ethylene
D
Cytokinin
Answer :
Ethylene
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157.
During seed germination its stored food is mobilized
A
Cytokinin
B
ABA
C
Gibberellin
D
Ethylene
Answer :
Gibberellin
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158.
The activity of ?-amylase in the endospore of barley germinating seed is induced by
A
Enthlene
B
Cytokinin
C
IAA
D
Gibberellin
Answer :
Gibberellin
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159.
ABA is involved in
A
dormancy of seeds
B
root elongation
C
shoot elongation
D
increased cell division
Answer :
dormancy of seeds
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160.
Auxin is mainly produces by
A
Apical root meristem
B
Root cambium
C
Apical shoot meristem
D
Phloem in shoot tip
Answer :
Apical shoot meristem
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