Plant Hormone Quiz | Plant Hormone Objective Type Questions and Answers

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Questions
21 All are natural auxins except
A IAA
B Phenoxy acetic acid
C Indole-3-acetic acid
D NAA

Answer: NAA
22 Which of the following is an auxin receptor
A ETR1
B CBP1
C ABP1
D GRE

Answer: ABP1
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23 Which of the following bioassays are used to detect the presence of auxin
A Avena curvature test and tobacco pith culture
B Split pea stem curvature test and tobacco pith culture
C Avena curvature test and Split pea stem curvature test
D tobacco pith culture only

Answer: Avena curvature test and Split pea stem curvature test
24 All are synthetic auxins except
A NAA
B IAA
C 2,4,-D
D None of the above

Answer: IAA
25 Which of the following auxin is widely used as a selective weedicide
A IBA
B 2,4,-D
C NAA
D 2,4,5-T

Answer: 2,4,-D
26 Which of the following hormone is found in gaseous form?
A Florigens
B Abscisic Acid
C Ethylene
D Auxin

Answer: Ethylene
27 Which of the following statement is incorrect?
A Auxins are the most important plant hormone
B Auxins are produced at the region of elongation
C Indoleacetic Acid (IAA) is a principal auxin
D Auxins are also important in regulating the fall of leaves and fruits

Answer: Auxins are produced at the region of elongation
28 Which plant hormone helps in breaking the dormancy of plant?
A Auxin
B Gibberellin
C Cytokinin
D Ethylene

Answer: Gibberellin
29 Which hormone is formed in leaves and helps in the blooming of the flowers?
A Traumatic
B Auxin
C Florigens
D None of the above

Answer: Florigens
30 Name the plant hormone which increases the activity of cambium in the wooden plants?
A Gibberellins
B Cytokinins
C Auxins
D Ethylene

Answer: Gibberellins
31 Which of the following is NOT a plant hormone?
A Corticosteroid
B Brassinosteroid
C Polyamines
D Salicylic acid

Answer: Corticosteroid
32 Name the amino acid which acts as a precursor of auxin biosynthesis?
A Serine
B Tryptophan
C Valline
D Tyrosine

Answer: Tryptophan
33 Mark the one, which is NOT a physiological effect of auxin?
A Cell elongation
B Stem elongation
C Cell differentiation
D Rooting

Answer: Stem elongation
34 Gibberellin that is synthesized in the shoot transported to different parts of the plant by which medium?
A Xylem
B Sieve tube
C Aleurone layer
D Phloem

Answer: Phloem
35 Which of the following plant hormone causes a delay in leaf senescence?
A Abscisic acid
B Ethylene
C Auxin
D Cytokines

Answer: Cytokines
36 Deficiency in which of the following hormone causes dwarfism in the plant?
A Ethylene
B Abscisic acid
C Gibberellin
D Brassinosteroid

Answer: Brassinosteroid
37 All the following hormones are growth inhibitors except
A Absiccic acid
B dormin
C ethylene
D IAA

Answer: IAA
38 Which of the following is a gaseous hormone
A IBA
B NAA
C Abscicic acid
D Ethylene

Answer: Ethylene
39 Which of the following is widely used as a rooting hormone
A NAA
B 2,4, D
C 2,4,5-T
D cytokinnin

Answer: NAA

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