171.
The pigment, that absorbs red and far red light in plants, is A
xanthophyll
B
cytochrome
C
phytochrome
D
carotene
Answer :
phytochrome
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172.
Mimosa (touch me not plant) shows A
Thigmotropism movement
B
Chemotactic movement
C
Thigmonasty
D
Seismonasty
Answer :
Seismonasty
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173.
2, 4 - D is a synthetic A
Auxin
B
Gibberllin
C
Cuytokinin
D
Florigen
Answer :
Auxin
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174.
Which combination of gases is suitable for fruit ripening? A
80% $$C{O_2}$$ and 20% $$C{H_2}$$
B
80% $$C{H_4}$$ and 20% $$C{O_2}$$
C
80% $$C{O_2}$$ and 20% $${O_2}$$
D
80% $${C_2}{H_4}$$ and 20% $$C{O_2}$$
Answer :
80% $${C_2}{H_4}$$ and 20% $$C{O_2}$$
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175.
In order to increase the yield of sugarcane crop, which of the following plant growth regulators should be sprayed? A
Cytokinins
B
Ethylene
C
Auxins
D
Gibberellins
Answer :
Gibberellins
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176.
Pneumatophore are A
Positively geotropic
B
Negative phototropic
C
Negatively geotropic
D
Hydrotropic
Answer :
Negatively geotropic
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177.
Gibberelling stimulates flowering in A
The plants growing in japanese farms
B
The short day plants
C
The long day plants
D
Day neutral plants
Answer :
The long day plants
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178.
The hormone produced during adverse environmental condition is A
Abscisic acid
B
N6-Isopentanyl denine (CK)
C
Dichlorophenozy acetic acid (2,4-D)
D
Gibberellic acid (CA)
Answer :
Abscisic acid
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179.
It takes very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield? A
Auxin and Ethylene
B
Gibberellin and Cytokinin
C
Gibberellin and Abscisic acid
D
Cytokinin and Abscisic acid
Answer :
Auxin and Ethylene
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180.
Importance of day length in flowering of plants was first shown in A
lemna
B
tobacco
C
cotton
D
petunia
Answer :
tobacco
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