Plant Growth and Development Quiz | Plant Growth and Development Objective Type Questions and Answers

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Questions
21 Internodal elongation is prompted by the action of
A Auxins
B Gibberellic acid
C Cytokinin
D Abscisic acid

Answer: Gibberellic acid
22 Bioassay for gibberellins is
A Avena curvature test
B Seed dormancy test
C Dwarf maize test
D Green leaf test

Answer: Dwarf maize test
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23 Scientist who first isolated cytokinin was
A White
B Skoog
C Letham
D Miller

Answer: 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

Answer: Log phase
27 Removal of apical bud makes the plant
A Bushy
B Grow rapidly
C Grow slowly
D Dormant

Answer: Bushy
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

Answer: Root Apex
30 Hormone involved in inhibition of growth is
A ABA
B Ethylene
C None of the above
D Both A and B

Answer: 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

Answer: IAA,GA and CK
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

Answer: Cucumber
34 Long short day plant is
A Bryophyllum
B Tomato
C Potato
D Cucumber

Answer: Bryophyllum
35 Optimum growth occurs in
A Blue light
B White light
C Red light
D Green light

Answer: White light
36 Crescograph was invented by
A Bose
B Pfeffer
C Gaming
D Dixon

Answer: Bose
37 Which one is not a growth promoter?
A ABA
B GA
C IAA
D CK

Answer: ABA
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

Answer: Both A and B
40 In excess, CO2
A Accelerates growth
B Does not influence growth
C Inhibits growth
D Slows down growth

Answer: Inhibits growth

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