-
question_answer1)
Gibberellin was first extracted from [BHU 1978, 88, 89; CPMT 1996, 98]
A)
Gibberella fujikuroi done
clear
B)
Algae done
clear
C)
Bacteria done
clear
D)
Roots of higher plants done
clear
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question_answer2)
Specific property attributed to gibberellins is [CPMT 1975, 84; DPMT 1984, 90; MP PMT 1987, 90; BHU 1983; KCET 2004]
A)
Shortening of genetically tall plants done
clear
B)
Elongation of genetically dwarf plant done
clear
C)
Promotion of rooting done
clear
D)
Yellowing of young leaves done
clear
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question_answer3)
Gibberellic acid has been successfully used to induce flowering [MP PMT 1986]
A)
In short day plants under long day conditions done
clear
B)
In long day plants under short day conditions done
clear
C)
For some plants done
clear
D)
None of the above done
clear
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question_answer4)
Cell elongation in internodal region takes place due to [CPMT 1989; CBSE PMT 2004]
A)
Gibberellins done
clear
B)
Ethylene done
clear
C)
Cytokinins done
clear
D)
Indole acetic acid done
clear
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question_answer5)
Which of the following plant hormone substitutes for long photoperiods in flowering plants [CPMT 1990; BHU 2004]
A)
Auxins done
clear
B)
Gibberellins done
clear
C)
Cytokinins done
clear
D)
Ethylene done
clear
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question_answer6)
Gibberellic acid induces flower [CBSE PMT 1997]
A)
In some gymnospermic plants only done
clear
B)
In long day plants under short day conditions done
clear
C)
In short day plants under long day conditions done
clear
D)
In day neutral plants under dark conditions done
clear
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question_answer7)
Which of the following is used to sprout the potato in winter
A)
Kinetin done
clear
B)
Xylene done
clear
C)
Ethylene done
clear
D)
Gibberellin done
clear
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question_answer8)
The number of gibberellins known till now is
A)
15 done
clear
B)
26 done
clear
C)
38 done
clear
D)
60 done
clear
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question_answer9)
Petals of which of the plant contains gibberellins
A)
Cassia fistula done
clear
B)
Rosa indica done
clear
C)
Pisum sativum done
clear
D)
Negella sativa done
clear
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question_answer10)
Gibberellins cause or Gibberellins stimulate [BHU 1988; CPMT 1988; RPMT 1984]
A)
Elongation of internodes done
clear
B)
Curvature of coleoptile done
clear
C)
Cell division done
clear
D)
Initiation of lateral roots done
clear
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question_answer11)
Gibberellins differ from auxins since they produce [CPMT 1986]
A)
Cell division done
clear
B)
Stem elongation done
clear
C)
Root initiation done
clear
D)
Shortening of internodes done
clear
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question_answer12)
The hormone which was discovered through 'foolish seedling' disease of rice is [AIIMS 1994]
A)
Indole-3-acetic acid done
clear
B)
Ethylene done
clear
C)
Gibberellic acid done
clear
D)
Kinetin done
clear
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question_answer13)
Gibberellic acid is a product of [CPMT 1993, 94, 2003]
A)
Algae done
clear
B)
Gibberella fujikuroi done
clear
C)
Protein done
clear
D)
None of these done
clear
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question_answer14)
Bioassay for gibberellin is
A)
Green leaf test/Richmond-Lang effect done
clear
B)
Cell division/Bud induction test done
clear
C)
Dwarf maize/Barley aleurone test done
clear
D)
Avena curvature test done
clear
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question_answer15)
At the onset of seed germination, the digestive enzymes amylase are produced by the action of [AMU 1992; BHU 2005]
A)
Auxins done
clear
B)
Gibberellins done
clear
C)
Cytokinins done
clear
D)
Ethylene done
clear
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question_answer16)
Which of the following exhibits a non-polar movement
A)
Auxin done
clear
B)
Gibberellin done
clear
C)
ABA done
clear
D)
Auxin and cytokinin done
clear
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question_answer17)
The habit of a cabbage or acaulescent plant can be changed drastically by the application of
A)
IAA done
clear
B)
\[G{{A}_{3}}\] done
clear
C)
ABA done
clear
D)
2, 4-D done
clear
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question_answer18)
In some plants, the cold treatment may be replaced by the application of
A)
Ethylene done
clear
B)
Cytokinin done
clear
C)
Gibberellin done
clear
D)
Abscissic acid done
clear
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question_answer19)
Gibberellin is obtained from a [DPMT 2004]
A)
Fungus done
clear
B)
Alga done
clear
C)
Basidiolichen done
clear
D)
Flowering plants done
clear
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question_answer20)
Gibberellin is helpful in [MP PMT 1999]
A)
Elongation of plants done
clear
B)
Inducing dwarfism done
clear
C)
Fat hydrolysis done
clear
D)
Protein synthesis done
clear
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question_answer21)
Gibberellins were first discovered in fungal genus [MP PMT 1999]
A)
Mucor done
clear
B)
Rhizopus done
clear
C)
Agaricus done
clear
D)
Fusarium done
clear
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question_answer22)
Which of the following breaks the dormancy of potato tubers [CPMT 2001]
A)
IAA done
clear
B)
ABA done
clear
C)
Zeatin done
clear
D)
Gibberellin done
clear
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question_answer23)
Apical dominance is not affected by [MP PMT 2001]
A)
Indole acetic acid done
clear
B)
Gibberellic done
clear
C)
Indole acetaldehyde done
clear
D)
Indole butyric acid done
clear
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question_answer24)
Dormancy of seed is broken by [RPMT 2002; Pb. PMT 2004]
A)
Auxin done
clear
B)
Gibberellins done
clear
C)
Ethylene done
clear
D)
Cytokinin done
clear
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question_answer25)
The activity of \[\alpha \]-amylase in the endosperm of barley germinating seed is induced by [MP PMT 2002]
A)
Ethylene done
clear
B)
Cytokinin done
clear
C)
IAA done
clear
D)
Gibberellin done
clear
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question_answer26)
The gibberellins are plant growth hormones. They cause elongation of stems. Gibberellin was first isolated by Japanese workers from [CPMT 1993, 94, 2003; AIEEE 2003]
A)
Endosperm of barley done
clear
B)
Sporophyte of moss done
clear
C)
A parasitic fungus done
clear
D)
Scutellum of rice done
clear
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question_answer27)
The hormone involved in metabolism of food material in cereal grain during germination is [DPMT 2003]
A)
Auxin done
clear
B)
CKN done
clear
C)
GA done
clear
D)
None of these done
clear
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question_answer28)
Gibberellin is [Harayana PMT 2005]
A)
Sugar done
clear
B)
Sterol done
clear
C)
Vitamin done
clear
D)
None of these done
clear
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question_answer29)
Genetic dwarfness can be overcome by treating with [MHCET 2003]
A)
Cytokinin done
clear
B)
Auxins done
clear
C)
Gibberellins done
clear
D)
Ethylen done
clear
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question_answer30)
By which of the following method seed dormancy can be broken or its duration can be reduced [AMU 2005]
A)
Skretching of seed coat done
clear
B)
Layering of seeds done
clear
C)
Change in the light, pressure and temperature done
clear
D)
All of the above done
clear
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question_answer31)
Gibberellins can promote seed germination because of their influence on [AIIMS 2005]
A)
Rate of cell division done
clear
B)
Production of hydrolyzing enzymes done
clear
C)
Synthesis of abscisic acid done
clear
D)
Absorption of water through hard seed coat done
clear
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