71.
Wheat, potato and henbane are
A
SDP
B
DNP
C
LNP
D
LDP
Answer :
LDP
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72.
Auxanometer is meant for measuring
A
Respiratory activity
B
Photosynthetic activity
C
Growth activity
D
Osmotic pressure
Answer :
Growth activity
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73.
Gibbereling was isolated from
A
An alga
B
A fungus
C
A bacterium
D
A virus
Answer :
A fungus
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74.
Long day plant's produces flowers when they exposed to
A
Any duration of light
B
Light period longer than a critinal day lenght
C
Light period longer than 12 hrs.
D
None of the above
Answer :
Light period longer than a critinal day lenght
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75.
The regulator which retards ageing/senescence of plant parts is :
A
cytokinin
B
auxin
C
gibberellin
D
abscisic acid
Answer :
cytokinin
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76.
The hormone responsible for apical dominance is
A
IAA
B
GA
C
ABA
D
florigen
Answer :
IAA
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77.
The clasical experiments on growth were performed by
A
Lamarck and Boysen Tansen
B
Boysen Jansen and Darwin
C
Darwin and Lamarck
D
Devries and Paal
Answer :
Boysen Jansen and Darwin
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78.
What causes a green plant to bend towards light as it grows
A
Because green plants need light to carry on photosynthesis
B
Because green plants are phototropic
C
Light stimulates plant cells on the lighted side to grow faster
D
Auxin accumulates on the shaded side
Answer :
Auxin accumulates on the shaded side
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79.
Which one increases in the absence of light?
A
Uptake of minerals
B
Uptake of water
C
Elongation of internodes
D
Ascent of sap
Answer :
Elongation of internodes
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80.
Growth hormone acts
A
Always as growth promotors
B
Always are growth inhibitors
C
Some as promotors and some as inhibitors
D
Rarely as growth inducers
Answer :
Some as promotors and some as inhibitors
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