Olete.in – MCQs, Mock Tests & Government Job Prep | Botany Botany MCQS[NEET-2021 to 2022]-Plant harmones

The term auxin was coined by

1. Skoog
2. Miescher
3. Haberlandt
4. F.W. Went

✅ Correct Answer: 4

Precursor of Indole acetic acid (natural auxin) is

1. Glycine
2. Methionine
3. Isopentynyl pyrophosphate
4. Tryptophan

✅ Correct Answer: 4

All the following hormones are growth inhibitors except

1. IAA
2. ethylene
3. dormin
4. Absiccic acid

✅ Correct Answer: 1

Which of the following is a gaseous hormone

1. Abscicic acid
2. IBA
3. Ethylene
4. NAA

✅ Correct Answer: 3

Which of the following is widely used as a rooting hormone

1. 2,4, D
2. NAA
3. cytokinnin
4. 2,4,5-T

✅ Correct Answer: 2

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

✅ Correct Answer: 3

All the following inhibits auxin transport (anti-auxins) except

1. ethylene
2. 2,3,5-tri iodo benzoic acid
3. &#945; naphthyl thalamic acid
4. Cytokinnin

✅ Correct Answer: 4

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

✅ Correct Answer: 3

All are synthetic auxins except

1. 2,4,5-T
2. 2,4,-D
3. IAA
4. NAA

✅ Correct Answer: 3

Auxin transport is

1. polar
2. non-polar
3. apoplast
4. symplast

✅ Correct Answer: 1

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

✅ Correct Answer: 3

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

✅ Correct Answer: 4

Nodule formation is induced by

1. IAA
2. IBA
3. NAA
4. Both (A) and (C)

✅ Correct Answer: 1

All are natural auxins except

1. Phenoxy acetic acid
2. Indole-3-acetic acid
3. NAA
4. IAA

✅ Correct Answer: 3

Which of the following is an auxin receptor

1. ETR1
2. CBP1
3. ABP1
4. GRE

✅ Correct Answer: 3

Cytokinins are

1. adenine derivatives
2. Guanine derivatives
3. Uracil derivatives
4. Thymine derivatives

✅ Correct Answer: 1

Which of the following is a natural cytokinin

1. isopentanyl adenine
2. zeatin
3. 6-amino purine
4. 6-isopentanyl aenine

✅ Correct Answer: 2

The first kinetin isolated by Miller was from

1. maize grains
2. coconut endosperm
3. wheat grains
4. herring sperm DNA

✅ Correct Answer: 4

The first natural cytokinin isolated from liquid endosperm was

1. zeatin
2. isopentanyl adenine
3. 6-amino purine
4. 6-isopentanyl aenine

✅ Correct Answer: 1

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

✅ Correct Answer: 3

Plant hormone which is responsible for saving the crops from falling

1. Cytokinin
2. Ethylene
3. Gybberellin
4. Auxin

✅ Correct Answer: 4

The plant hormone which is found in gaseous form

1. Florigens
2. Gybberellin
3. Cytokinin
4. Ethylene

✅ Correct Answer: 4

Plant hormone which is responsible for the ripening of fruits

1. Florigens
2. Ethylene
3. Abscisic Acid
4. Gybberellin

✅ Correct Answer: 2

Name the plant hormone which is helpful in making RNA and protein?

1. Cytokinins
2. Traumatic
3. Auxin and cytokinins
4. Auxin only

✅ Correct Answer: 1

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

✅ Correct Answer: 1

Name the plant hormone which is help in breaking the dormancy of plant?

1. Auxin
2. Auxin and Gibberellin
3. Gibberellin
4. None

✅ Correct Answer: 3

The plant hormone which is formed in leaves and helps in the blooming of the flowers

1. Auxin
2. gibberelin
3. Cytokinin
4. Florigens

✅ Correct Answer: 4

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

✅ Correct Answer: 4

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

✅ Correct Answer: 4

Which of the plant hormone increases the activity of cambium in the wooden plants?

1. Florigens
2. Gibberellins
3. Cytokinins
4. Auxin and Gibberelin

✅ Correct Answer: 2

Coconut milk factor is

1. Cytokinin
2. Auxin
3. Auxin and cytokinins
4. Gibberelin

✅ Correct Answer: 1

Synthetic auxin is

1. NAA
2. GA
3. IBA
4. Both A and C

✅ Correct Answer: 4

The enzyme which is stimulate germination of barley seeds is

1. Lipase
2. Protease
3. Invertase
4. ÃŽÂ±-amylase

✅ Correct Answer: 4

Seed dormancy is due to the

1. Abscisic acid
2. Auxin
3. Gibberelin
4. None

✅ Correct Answer: 1

Importance of day length in flowering of plants was first shown in

1. Tobacco
2. Petunia
3. Letting
4. None

✅ Correct Answer: 1

Phototropic curvature is the result of uneven distribution of

1. Auxin and giberrellins
2. Auxin
3. Gibberellin
4. Cytokinins

✅ Correct Answer: 2

Coiling of garden pea tendrils around any support is an example of

1. Thigmotropism
2. Thermotaxis
3. Thigmotaxis
4. Thigmonasty

✅ Correct Answer: 1

Natural cytokinins are synthesized in tissues that are

1. Senescent
2. Storing food material
3. Dividing rapidly
4. Differentiating

✅ Correct Answer: 3

Gaseous plant hormone is

1. Gibberellin
2. IAA
3. Abscisic acid
4. Ethylene

✅ Correct Answer: 4

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

✅ Correct Answer: 1

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

✅ Correct Answer: 1

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

✅ Correct Answer: 2

Acids which is a derivative of carotenoids

1. IBA
2. Abscisic acid
3. IAA
4. Gibberellic aciD

✅ Correct Answer: 2

Cell elongation in internodal regions of the green plants takes place due to

1. Gibberellin
2. Cytokinins
3. IAA
4. IBA

✅ Correct Answer: 1

Which one of the following pairs, is correctly matched

1. IAA Ã¢â‚¬â€œ Cell wall elongation
2. Abscisic acid Ã¢â‚¬â€œ Stomatal closure
3. Cytokinin Ã¢â‚¬â€œ Cell division
4. All

✅ Correct Answer: 4

Plant hormone which is responsible for environmental stress and dormancy is

1. Abscisic acid
2. Auxin
3. Cytokines
4. IBA

✅ Correct Answer: 1

Auxin is produced in

1. Growing root tips
2. Old roots
3. Growing shoot tips
4. Both A and C

✅ Correct Answer: 4

Stem elongation is controlled through

1. Auxin
2. Gibberellins
3. Auxin and cytokinins
4. None

✅ Correct Answer: 2

Amyloplasts are

1. Tonoplast
2. Chloroplasts
3. Large starch grains
4. None

✅ Correct Answer: 2

Gibberellins are produced commercially from

1. Virus culture
2. Plant culture
3. Bacterial culture
4. Fungal culture

✅ Correct Answer: 4

Antagonistic to gibberellins, flowering is promoted in short day plants by

1. Abscisic acid
2. Methane
3. Auxin
4. Gibberelin

✅ Correct Answer: 1

Gibberelins sometimes substitute for

1. blue light
2. red light
3. green light
4. yellow light

✅ Correct Answer: 2

Weed killing is done by

1. IAA
2. IBA
3. 2,4 D
4. None

✅ Correct Answer: 3

Bud initiation in shoots in promoted by

1. Auxin
2. Gibberelin
3. Auxin and cytokinins
4. None

✅ Correct Answer: 1

Bolting of some rosette plants is promoted by

1. giberellins
2. Auxin
3. ethane
4. None

✅ Correct Answer: 1

IAA is

1. indole acetic acid
2. Iodine acetic acid
3. initiator acetic acid
4. None

✅ Correct Answer: 1

Sprouting of potatoes is inhibited by

1. 2,4 D
2. IAA
3. IBA
4. Cytokinin

✅ Correct Answer: 1

Gibberellins was named after a fungus known as

1. Gibberella fujikuroi
2. Gibberella gaditijirrii
3. Gibberella africana
4. Gibberella acuminata

✅ Correct Answer: 1

The most studied gibberellin is

1. GA1
2. GA3
3. GA5
4. GA7

✅ Correct Answer: 2

All are anti giberrellins except

1. phosphon D
2. acetosyringone
3. maleic hydrazide
4. None

✅ Correct Answer: 2