Q.1
Leaf abscission is brought about by ... ..... [ BHU 2006]
  • a) Auxin
  • b) Cytokinin
  • c) Gibberellin
  • d) ABA
Q.2
Phytochrome absorbs visible light maximum in red region at ... .... [ AFMC 1997]
  • a) 600 nm
  • b) 650 nm
  • c) 660 nm
  • d) 730 nm
Q.3
Common inhibitor of germination is ... .... [ JIPMER 2002]
  • a) GA
  • b) ABA
  • c) Pantothenic acid
  • d) Tartaric acid
Q.4
Apical dominance is caused by .... ...[ CBSE 1992]
  • a) Abscisic acid in lateral bud
  • b) Cytokinin in leaf tip
  • c) Gibberellin in lateral buds
  • d) Auxin in shoot tip
Q.5
Synthetic plant hormone is ... ... [ CBSE 2009]
  • a) IAA
  • b) 2,4-D/NAA
  • c) GA
  • d) Zeatin
Q.6
Types of plants that come to flower after exposure to short photoperiods followed by long photoperiods ... .... [ AMU 2002]
  • a) Intermediate plants
  • b) Day neutral plants
  • c) SLDP
  • d) LSDP
Q.7
Klinostat is employed in the study of ... .... [ CBSE 1993]
  • a) Osmosis
  • b) Growth movements
  • c) Photosynthesis
  • d) Respiration
Q.8
Vernalisation occurs in response to ... .... [ DPMT 2002]
  • a) High light intensity
  • b) Low temperature
  • c) High temperature
  • d) Low light intensity
Q.9
Bakane disease of Rice is due to ... ... [ JIPMER 1998]
  • a) NAA
  • b) 2, 4-D
  • c) IAA
  • d) GA
Q.10
Auxin synthesis occurs in ... .... [ JIPMER 2004 ]
  • a) Root/shoot tips
  • b) Cortex
  • c) Xylem
  • d) Phloem cells
Q.11
Gibberellin is a ... ... [ Har PMT 2005]
  • a) Sterol
  • b) Vitamin
  • c) Sugar
  • d) Protein
Q.12
A plant hormone that induces morphogenesis in plant tissue culture is .... ... [ CBSE 1998]
  • a) Abscisic acid
  • b) Gibberellin
  • c) Cytokinin
  • d) Ethylene
Q.13
Cholodny-Went theory is connected with ... ...[ BHU 2008]
  • a) Photomorphogenesis
  • b) Phototropism
  • c) Geotropism
  • d) Both b and c
Q.14
Cytokinins .... ... [ CBSE 1992]
  • a) Promote abscission
  • b) Influence water movement
  • c) Help retain chlorophyll
  • d) Inhibit protoplasmic streaming
Q.15
Phototropic curvature is result of uneven distribution of ... ... [ CBSE 2010]
  • a) Auxin
  • b) Gibberellin
  • c) Starch
  • d) Phytochrome
Q.16
Pick up correct statements .... ... [kerala 2008] a) Cytokinins delay senescence b) Auxins regulate apical dominance c) Ethylene enhance seed germination d) Gibberellins cause falling of immature leaves
  • a) a, c
  • b) a, d
  • c) a, b
  • d) b, c
Q.17
IAA precursor is .... .... [ CPMT 1990]
  • a) Tryptophan
  • b) Leucine
  • c) Tyrosine
  • d) Phenylalanine
Q.18
Ethylene is metabolic product of ... ...
  • a) Valine
  • b) Serine
  • c) Methionine
  • d) Glutamic acid
Q.19
Herbicides are chemicals which control ... ... [ BHU 1994]
  • a) Insects
  • b) Fungi
  • c) Weeds
  • d) Nematodes
Q.20
Which in not caused by deficiency of mineral nutrition? ... ..... [ CBSE 1997]
  • a) Chlorosis
  • b) Internode shortening
  • c) Necrosis
  • d) Etiolation
Q.21
Which flower shows nyctinastic movement? ... ... [ Pb. PMT 2005]
  • a) Albizia lebbeck
  • b) Pentapetes
  • c) Mimosa pudica
  • d) Bryophyllum
Q.22
Leaf of Mimosa droops down on touching because of ... ... [ BHU 2000 ]
  • a) Water loss from leaf bases
  • b) Changes in water concentration
  • c) Loss of water from cells to intercellular spaces in pulvinus and pulvinules
  • d) All the above
Q.23
A long day plant flowers only when it is exposed to ... .... [ AMU 2001]
  • a) Red light
  • b) Light more than critical day length
  • c) Light equal to critical day length
  • d) Light less than critical day length
Q.24
Some early experiments on phototropic curvature in grasses led to discovery of ... ... [ Pb PMT 1998]
  • a) Auxins
  • b) Gibberellins
  • c) Cytokinins
  • d) None of the above
Q.25
Hormone found in liquid endosperm of Coconut/Coconut milk factor is ... ... [ AFMC 2007]
  • a) Gibberellin
  • b) Auxin
  • c) Ethylene
  • d) Cytokinin
Q.26
Day neutral plants ... ... [ JKCMEE 2011]
  • a) Lose activity during day time
  • b) Flower in all possible photoperiods
  • c) Become overactive during day time
  • d) Do not flower in any photoperiod
Q.27
Which one shows red ⇄ far-red interconversions? .... .. [ BHU 1995]
  • a) Carotenoids
  • b) Cytochromes
  • c) Chlorophylls
  • d) Phytochrome
Q.28
Hormone antagonist to gibberellins is ... ...
  • a) IAA
  • b) ABA
  • c) Zeatin
  • d) Ethylene
Q.29
Phytochrome is found in ... ...[ AFMC 2003]
  • a) Algae
  • b) Fungi
  • c) Vascular cryptogams
  • d) Flowering plants
Q.30
Which is not a phytohormone? ... ... [ Har PMT 1994]
  • a) Phytochrome
  • b) Florigen
  • c) GA
  • d) IAA
Q.31
Essential requirement for seed germination is ... ... [ CPMT 2005]
  • a) O2 and light
  • b) H2O and O2
  • c) H2O and high temperature
  • d) Scarification and vernalisation
Q.32
The process of growth is maximum during
  • a) Senescence
  • b) Dormancy
  • c) Log phase
  • d) Lag phase
Q.33
Cardinal temperature is related to ... .... [ AIIMS 1999 [
  • a) Minimum temperature
  • b) Optimum temperature
  • c) Maximum temperature
  • d) All the above
Q.34
Which one hastens flowering in plants .... ... [ MHTCET 2011]
  • a) Stratification
  • b) Scarification
  • c) Vernalisation
  • d) Water deficit
Q.35
Bananas can be prevented from overripening by ... .... [ CBSE 1992]
  • a) Maintaining them at room temperature
  • b) Refrigeration
  • c) Dipping in ascorbic acid solution
  • d) Storing in a freezer
Q.36
Photoperiodic stimulus is picked up by .... ... [ BHU 2001]
  • a) Phytohormones
  • b) Stomata
  • c) Phytochrome
  • d) Enzymes
Q.37
hich is essential for flowering .... ... [ Odisha 2012]
  • a) Phytochrome
  • b) Chlorophyll
  • c) Cytochrome
  • d) Leghaemoglobin
Q.38
Substances that accumulate around a site of infection in plants is ... ... [ JIPMER 1999 ]
  • a) Phytoalexins
  • b) Proteinone
  • c) Saponins
  • d) All the above
Q.39
Which is not an influence of auxins .... ... [ KCET 2006]
  • a) Tropical movements
  • b) Bolting
  • c) Parthenocarpy
  • d) Apical dominance
Q.40
Internodal elongation is stimulated by ... ... [ JKCET 2012]
  • a) Auxin
  • b) Phenol
  • c) Cytokinin
  • d) Gibberellin
Q.41
Movement of auxin is ... ... [ CBSE 1994]
  • a) Centripetal
  • b) Basipetal
  • c) Acropetal
  • d) Both b and c
Q.42
Shedding of leaves, flowers and fruits due to change in hormone balance in plants is ... ... [ JKCMEE 2005]
  • a) Senescence
  • b) Abscission
  • c) Photoperiodism
  • d) Vernalisation
Q.43
Abscisic acid causes ... ... [ CBSE 1999 ]
  • a) Seed dormancy
  • b) Apical dominance
  • c) Root initiation
  • d) Phototropism
Q.44
Growth of lateral branches is promoted by ... ... [ KCET 2002]
  • a) Removal of axillary buds
  • b) Auxin application over decapitated apex
  • c) Auxin application over apical bud
  • d) Removal of apical bud
Q.45
In short day plants, flowering is induced by ... ...[ BHU 2001]
  • a) Photoperiod less than 12 hours
  • b) Photoperiod below a critical length and uninterrupted long night
  • c) Long night
  • d) Short photoperiod and interrupted long night
Q.46
Which ones are long day plants... .. [ Guj CET 2007]
  • a) Wheat, Poppy, Soybean
  • b) Wheat, Poppy, Beet
  • c) Wheat, Oat, Soybean
  • d) Wheat, Xanthium,
Q.47
Transport of cytokinin in the plant body is ... ... [ CET Chd 2011]
  • a) Basipetal
  • b) Lateral
  • c) Acropetal
  • d) One all sides
Q.48
Growth plotted against time gives a ... ... [MPPMT 1998]
  • a) Parabolic curve
  • b) Sigmoid curve
  • c) Upright line
  • d) Horizontal line
Q.49
Rosette habit of cabbage can be changed by the application of ... ... [ KCET 2011]
  • a) ABA
  • b) IAA
  • c) Ga
  • d) Ethephon
Q.50
Phototropism in shoots is attributed to or phototropic movements are due to ... .... [ AMU 1997]
  • a) Auxin
  • b) Gibberellins
  • c) Cytokinin
  • d) Abscisic acid
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