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Free download in PDF Plant Growth and Development 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)
Internodal elongation is prompted by the action of
[A]
Auxins
[B]
Gibberellic acid
[C]
Cytokinin
[D]
Abscisic acid
(22)
Bioassay for gibberellins is
[A]
Avena curvature test
[B]
Seed dormancy test
[C]
Dwarf maize test
[D]
Green leaf test
(23)
Scientist who first isolated cytokinin was
[A]
White
[B]
Skoog
[C]
Letham
[D]
Miller
(24)
2,4-D stands for
[A]
2,4-Dichlorophenoxy acetic acid
[B]
2, 4-Dichloro butyric acid
[C]
2, 4- Dichloronapthoxy acetic acid
[D]
2, 4 dichloronaphthalene acetic acid
Answer: 2,4-Dichlorophenoxy acetic acid
(25)
Bioassay for auxin us
[A]
Dwarf maize test
[B]
Avena curvature test
[C]
Cell division test
[D]
Green leaf test
Answer: Avena curvature test
(26)
In organs of plants there is a variation in rate of growth i,t is first slow, then accelerated up to maximum and slows down to stand still the period of rigorous growth is known as
[A]
Black face
[B]
Period of growth
[C]
Grand period of growth
[D]
Log phase
(27)
Removal of apical bud makes the plant
[A]
Bushy
[B]
Grow rapidly
[C]
Grow slowly
[D]
Dormant
(28)
Cytokinins
[A]
Induce division and inhibit ageing
[B]
Maintain dormancy
[C]
Induce abscission
[D]
Inhibit cell division
Answer: Induce division and inhibit ageing
(29)
Cytokinins are mostly produced in
[A]
Shoot Apex
[B]
Root Apex
[C]
Young leaves
[D]
Lateral buds
(30)
Hormone involved in inhibition of growth is
[A]
ABA
[B]
Ethylene
[C]
None of the above
[D]
Both A and B
31
Growth promoters hormones are
[A]
IAA,ABA and CK
[B]
IAA,GA and ABA
[C]
IAA,GA and CK
[D]
ABA,CK AND GA
32
Major function of CK is to
[A]
Mobilise nutrients and prevent senescence
[B]
Mobilise nutrients
[C]
Prevent senescence
[D]
Produce IAA
Answer: Mobilise nutrients and prevent senescence
33
DNP is
[A]
Cestrum
[B]
Cucumber
[C]
Potato
[D]
Radish
34
Long short day plant is
[A]
Bryophyllum
[B]
Tomato
[C]
Potato
[D]
Cucumber
35
Optimum growth occurs in
[A]
Blue light
[B]
White light
[C]
Red light
[D]
Green light
36
Crescograph was invented by
[A]
Bose
[B]
Pfeffer
[C]
Gaming
[D]
Dixon
37
Which one is not a growth promoter?
[A]
ABA
[B]
GA
[C]
IAA
[D]
CK
38
High C/N ratio produces
[A]
Softer tissue
[B]
More mechanical tissues
[C]
More growth hormones
[D]
Growth inhibitors
Answer: More mechanical tissues
39
Which one regulate plant growth
[A]
Commensalism
[B]
Climate
[C]
Hormones
[D]
Both A and B
40
In excess, CO2
[A]
Accelerates growth
[B]
Does not influence growth
[C]
Inhibits growth
[D]
Slows down growth
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