41.
Phototropic curvature is the result of uneven distribution of:
A
gibberellin
B
phytochrome
C
cytokinins
D
auxin
Answer :
auxin
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42.
Richomond lang effect due to cytokimins pertains to
A
Root formation
B
Apical dominance
C
Delay of senescence
D
Leaf formation
Answer :
Delay of senescence
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43.
Which of the following induces morphogenesis in tissue culture
A
Gibberellin
B
Cytokinin
C
IAA
D
Ethylene
Answer :
Cytokinin
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44.
Parthenocarpic tomato frutis can be produced by
A
Raising the plants from vernalized seeds
B
Trating the plants with phenylmercuric acetate
C
Removing androecium of flowers before pollen grains are released
D
Treating the plants with low concentration of gibberellic acid and auxins
Answer :
Treating the plants with low concentration of gibberellic acid and auxins
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45.
"Foolish seedling'' disease of rice led to the discovery of
A
ABA
B
2, 4-D
C
IAA
D
GA
Answer :
GA
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46.
Leaf fall can be prevented with the help of
A
abscisic acid
B
auxins
C
florigen
D
cytokinins
Answer :
cytokinins
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47.
Photohormone term was coined by
A
Gregory and Purvis
B
F.W. went
C
Thieman
D
L.J. Audus
Answer :
Thieman
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48.
Seed dormancy is due to the
A
ethylene
B
abscisic acid
C
IAA
D
starch
Answer :
abscisic acid
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49.
Among the following which helps in early ripening of fruits
A
Methane
B
Enthylene
C
CO2
D
CO
Answer :
Enthylene
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50.
Hormone responsible for senescence
A
ABA
B
Auxin
C
GA
D
Cytokinin
Answer :
ABA
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