11.
Hormone responsible for vernalization
A
Florigen
B
Caulocaline
C
Abscisin
D
Vernaline
Answer :
Vernaline
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12.
Pine apple can made to flowr is off season by the applcation
A
Zeatin
B
Ethylene
C
Short day
D
Low temperature
Answer :
Ethylene
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13.
In autumn leaf fall occurs, because
A
Formation of abscissiion layer at the base
B
Leaf becomes heaby
C
Leaf does not remain green
D
Of low temperture
Answer :
Formation of abscissiion layer at the base
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14.
In plants growth is
A
Restrited to certain regions or strucutre
B
Irreversible
C
Change in size
D
All of the above
Answer :
All of the above
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15.
Native auxin (Endogenous) in transported in the plant
A
From the shoot tip in the downward direction
B
From the root tip in the upward direction
C
Through vascular system in plants
D
By a special transport system in the root
Answer :
From the shoot tip in the downward direction
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16.
Ethylene gas is used for
A
growth of plants
B
delaying fruit's abscission
C
ripening of fruits
D
stopping the leaf abscission
Answer :
ripening of fruits
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17.
A gungus which secretes abscisic acid is
A
Aspergillus
B
Gibberella
C
Cercospora
D
Alternaria
Answer :
Cercospora
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18.
Coiling of garden pea tendrils around any support is an example of:
A
thigmotaxis
B
thigmonasty
C
thigmotropism
D
thermotaxis
Answer :
thigmotropism
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19.
Which of the following is not natural occuring plant hormone
A
2, 4-D
B
GA2
C
Gibberelling
D
I.A.A
Answer :
2, 4-D
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20.
Mimosa pudica (Sensitive plant) leafs movement due to
A
Nerve impulsion
B
Delicate leafs
C
Loss of tissue
D
Turgor change in leaf base
Answer :
Turgor change in leaf base
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