Bud initiation in shoots in promoted by
1.Auxin
2.Gibberelin
3.Auxin and cytokinins
4.None
The enzyme which is stimulate germination of barley seeds is
1.Lipase
2.Protease
3.Invertase
4.α-amylase
Acids which is a derivative of carotenoids
1.IBA
2.Abscisic acid
3.IAA
4.Gibberellic aciD
Agent orange the leaf defoliator used by USA in Vietnam war was
1.2,4,5-T, NAA and ethylene
2.2,4,-D and NAA
3.2,4,-D and 2,4,5-T
4.ethylene
Agrobacterium tumefaciens Ti plasmids t-DNA has genes for
1.Auxin and giberrellins
2.cytokinins and ethylene
3.Auxin and cytokinins
4.cytokinins and giberrellins
All are anti giberrellins except
1. phosphon D
2.acetosyringone
3.maleic hydrazide
4.None
All are natural auxins except
1.Phenoxy acetic acid
2.Indole-3-acetic acid
3.NAA
4.IAA
All are synthetic auxins except
1.2,4,5-T
2.2,4,-D
3.IAA
4.NAA
All the following hormones are growth inhibitors except
1.IAA
2.ethylene
3.dormin
4.Absiccic acid
All the following inhibits auxin transport (anti-auxins) except
1.ethylene
2.2,3,5-tri iodo benzoic acid
3.α naphthyl thalamic acid
4.Cytokinnin
Amyloplasts are
1.Tonoplast
2.Chloroplasts
3.Large starch grains
4.None
Antagonistic to gibberellins, flowering is promoted in short day plants by
1.Abscisic acid
2.Methane
3.Auxin
4.Gibberelin
Auxin is produced in
1.Growing root tips
2.Old roots
3.Growing shoot tips
4.Both A and C
Auxin transport is
1.polar
2.non-polar
3.apoplast
4.symplast
Bolting of some rosette plants is promoted by
1.giberellins
2.Auxin
3.ethane
4.None
Cell elongation in internodal regions of the green plants takes place due to
1.Gibberellin
2.Cytokinins
3.IAA
4.IBA
Coconut milk factor is
1.Cytokinin
2.Auxin
3.Auxin and cytokinins
4.Gibberelin
Coiling of garden pea tendrils around any support is an example of
1.Thigmotropism
2.Thermotaxis
3.Thigmotaxis
4.Thigmonasty
Cytokinins are
1.adenine derivatives
2.Guanine derivatives
3.Uracil derivatives
4.Thymine derivatives
Differentiation of shoot is controlled by
1.High cytokinin : auxin ratio
2.High auxin : cytokinin ratio
3.High gibberellin : auxin ratio
4.High gibberellin : cytokinin ratio
Gaseous plant hormone is
1.Gibberellin
2.IAA
3.Abscisic acid
4.Ethylene
Gibberelins sometimes substitute for
1.blue light
2.red light
3.green light
4.yellow light
Gibberellins are produced commercially from
1.Virus culture
2.Plant culture
3.Bacterial culture
4.Fungal culture
Gibberellins was named after a fungus known as
1.Gibberella fujikuroi
2.Gibberella gaditijirrii
3.Gibberella africana
4.Gibberella acuminata
IAA is
1.indole acetic acid
2.Iodine acetic acid
3.initiator acetic acid
4.None
Importance of day length in flowering of plants was first shown in
1.Tobacco
2.Petunia
3.Letting
4.None
The term auxin was coined by
1.Skoog
2.Miescher
3.Haberlandt
4.F.W. Went
Name the plant hormone which is formed in injured cells for healing of damage part ?
1.Auxin
2.Gibberelin
3.Cytokinin
4.None of the above
Name the plant hormone which is help in breaking the dormancy of plant?
1.Auxin
2.Auxin and Gibberellin
3.Gibberellin
4.None
Name the plant hormone which is helpful in making RNA and protein?
1.Cytokinins
2.Traumatic
3.Auxin and cytokinins
4.Auxin only
Natural cytokinins are synthesized in tissues that are
1.Senescent
2.Storing food material
3.Dividing rapidly
4.Differentiating
Nodule formation is induced by
1.IAA
2.IBA
3.NAA
4.Both (A) and (C)
Opening of floral buds into flowers, is a type of
1.Autonomic movement of growth
2.Autonomic movement of variation
3.Autonomic movement of locomotion
4.None
Phototropic curvature is the result of uneven distribution of
1.Auxin and giberrellins
2.Auxin
3.Gibberellin
4.Cytokinins
Plant hormone which is help in the cell division and development in the presence of auxins
1.Auxin
2.cytokinins and ethylene
3.Gibberellin
4.Cytokinnin only
Plant hormone which is responsible for environmental stress and dormancy is
1.Abscisic acid
2.Auxin
3.Cytokines
4.IBA
Plant hormone which is responsible for saving the crops from falling
1.Cytokinin
2.Ethylene
3.Gybberellin
4.Auxin
Plant hormone which is responsible for the ripening of fruits
1.Florigens
2.Ethylene
3.Abscisic Acid
4.Gybberellin
Precursor of Indole acetic acid (natural auxin) is
1.Glycine
2.Methionine
3.Isopentynyl pyrophosphate
4.Tryptophan
Seed dormancy is due to the
1.Abscisic acid
2.Auxin
3.Gibberelin
4.None
Sprouting of potatoes is inhibited by
1.2,4 D
2.IAA
3.IBA
4.Cytokinin
Stem elongation is controlled through
1.Auxin
2.Gibberellins
3.Auxin and cytokinins
4.None
Synthetic auxin is
1.NAA
2.GA
3.IBA
4.Both A and C
The annular and spirally thickened conducting elements generally developed in the protoxylem when the root or stem is
1.Maturing
2.Differentiating
3.Widening
4.Elongating
The first kinetin isolated by Miller was from
1.maize grains
2.coconut endosperm
3.wheat grains
4.herring sperm DNA
The first natural cytokinin isolated from liquid endosperm was
1.zeatin
2.isopentanyl adenine
3.6-amino purine
4.6-isopentanyl aenine
The most studied gibberellin is
1. GA1
2.GA3
3.GA5
4.GA7
The plant hormone which is formed in leaves and helps in the blooming of the flowers
1.Auxin
2.gibberelin
3.Cytokinin
4.Florigens
The plant hormone which is found in gaseous form
1.Florigens
2.Gybberellin
3.Cytokinin
4.Ethylene
Weed killing is done by
1.IAA
2.IBA
3.2,4 D
4.None
Which of the following auxin is widely used as a selective weedicide
1.NAA
2.IBA
3.2,4,-D
4.2,4,5-T
Which of the following bioassays are used to detect the presence of auxin
1.Split pea stem curvature test and tobacco pith culture
2.Avena curvature test and tobacco pith culture
3.Avena curvature test and Split pea stem curvature test
4.tobacco pith culture only
Which of the following is a gaseous hormone
1.Abscicic acid
2.IBA
3.Ethylene
4.NAA
Which of the following is a natural cytokinin
1.isopentanyl adenine
2.zeatin
3.6-amino purine
4.6-isopentanyl aenine
Which of the following is an auxin receptor
1.ETR1
2.CBP1
3.ABP1
4.GRE
Which of the following is not a function of auxin
1.inducing callus formation
2.maintaining apical dominance
3.enhancing cell division
4.inducing dormancy
Which of the following is widely used as a rooting hormone
1.2,4, D
2.NAA
3.cytokinnin
4.2,4,5-T
Which of the following statement is incorrect ?
1.Auxins are produced at the region of elongation
2.Auxins are the most important plant hormone
3.Auxins are also important in regulating the fall of leaves and fruits
4.IAA is a principal auxin
Which of the plant hormone increases the activity of cambium in the wooden plants?
1.Florigens
2.Gibberellins
3.Cytokinins
4.Auxin and Gibberelin
Which one of the following pairs, is correctly matched
1.IAA – Cell wall elongation
2.Abscisic acid – Stomatal closure
3.Cytokinin – Cell division
4.All