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Free download in PDF Plant Hormone Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(21)
All are natural auxins except
[A]
IAA
[B]
Phenoxy acetic acid
[C]
Indole-3-acetic acid
[D]
NAA
(22)
Which of the following is an auxin receptor
[A]
ETR1
[B]
CBP1
[C]
ABP1
[D]
GRE
(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
(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
(26)
Which of the following hormone is found in gaseous form?
[A]
Florigens
[B]
Abscisic Acid
[C]
Ethylene
[D]
Auxin
(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
(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
(30)
Name the plant hormone which increases the activity of cambium in the wooden plants?
[A]
Gibberellins
[B]
Cytokinins
[C]
Auxins
[D]
Ethylene
31
Which of the following is NOT a plant hormone?
[A]
Corticosteroid
[B]
Brassinosteroid
[C]
Polyamines
[D]
Salicylic acid
32
Name the amino acid which acts as a precursor of auxin biosynthesis?
[A]
Serine
[B]
Tryptophan
[C]
Valline
[D]
Tyrosine
33
Mark the one, which is NOT a physiological effect of auxin?
[A]
Cell elongation
[B]
Stem elongation
[C]
Cell differentiation
[D]
Rooting
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
35
Which of the following plant hormone causes a delay in leaf senescence?
[A]
Abscisic acid
[B]
Ethylene
[C]
Auxin
[D]
Cytokines
36
Deficiency in which of the following hormone causes dwarfism in the plant?
[A]
Ethylene
[B]
Abscisic acid
[C]
Gibberellin
[D]
Brassinosteroid
37
All the following hormones are growth inhibitors except
[A]
Absiccic acid
[B]
dormin
[C]
ethylene
[D]
IAA
38
Which of the following is a gaseous hormone
[A]
IBA
[B]
NAA
[C]
Abscicic acid
[D]
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
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