Q.1.
Leaf abscission is brought about by ... ..... [ BHU 2006]
-
18%
a) Auxin
-
45%
b) Cytokinin
-
9%
c) Gibberellin
-
27%
d) ABA
Q.2.
Phytochrome absorbs visible light maximum in red region at ... .... [ AFMC 1997]
-
25%
a) 600 nm
-
0%
b) 650 nm
-
50%
c) 660 nm
-
25%
d) 730 nm
Q.3.
Common inhibitor of germination is ... .... [ JIPMER 2002]
-
25%
a) GA
-
62%
b) ABA
-
12%
c) Pantothenic acid
-
0%
d) Tartaric acid
Q.4.
Apical dominance is caused by .... ...[ CBSE 1992]
-
0%
a) Abscisic acid in lateral bud
-
0%
b) Cytokinin in leaf tip
-
14%
c) Gibberellin in lateral buds
-
86%
d) Auxin in shoot tip
Q.5.
Synthetic plant hormone is ... ... [ CBSE 2009]
-
0%
a) IAA
-
67%
b) 2,4-D/NAA
-
0%
c) GA
-
33%
d) Zeatin
Q.6.
Types of plants that come to flower after exposure to short photoperiods followed by long photoperiods ... .... [ AMU 2002]
-
20%
a) Intermediate plants
-
60%
b) Day neutral plants
-
0%
c) SLDP
-
20%
d) LSDP
Q.7.
Klinostat is employed in the study of ... .... [ CBSE 1993]
-
60%
a) Osmosis
-
40%
b) Growth movements
-
0%
c) Photosynthesis
-
0%
d) Respiration
Explanation
Q.8.
Vernalisation occurs in response to ... .... [ DPMT 2002]
-
0%
a) High light intensity
-
40%
b) Low temperature
-
20%
c) High temperature
-
40%
d) Low light intensity
Q.9.
Bakane disease of Rice is due to ... ... [ JIPMER 1998]
-
20%
a) NAA
-
40%
b) 2, 4-D
-
0%
c) IAA
-
40%
d) GA
Q.10.
Auxin synthesis occurs in ... .... [ JIPMER 2004 ]
-
100%
a) Root/shoot tips
-
0%
b) Cortex
-
0%
c) Xylem
-
0%
d) Phloem cells
Q.11.
Gibberellin is a ... ... [ Har PMT 2005]
-
50%
a) Sterol
-
17%
b) Vitamin
-
17%
c) Sugar
-
17%
d) Protein
Q.12.
A plant hormone that induces morphogenesis in plant tissue culture is .... ... [ CBSE 1998]
-
40%
a) Abscisic acid
-
40%
b) Gibberellin
-
20%
c) Cytokinin
-
0%
d) Ethylene
Q.13.
Cholodny-Went theory is connected with ... ...[ BHU 2008]
-
0%
a) Photomorphogenesis
-
25%
b) Phototropism
-
0%
c) Geotropism
-
75%
d) Both b and c
Q.14.
Cytokinins .... ... [ CBSE 1992]
-
17%
a) Promote abscission
-
0%
b) Influence water movement
-
50%
c) Help retain chlorophyll
-
33%
d) Inhibit protoplasmic streaming
Q.15.
Phototropic curvature is result of uneven distribution of ... ... [ CBSE 2010]
-
33%
a) Auxin
-
33%
b) Gibberellin
-
0%
c) Starch
-
33%
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
-
0%
a) a, c
-
20%
b) a, d
-
60%
c) a, b
-
20%
d) b, c
Q.17.
IAA precursor is .... .... [ CPMT 1990]
-
25%
a) Tryptophan
-
50%
b) Leucine
-
25%
c) Tyrosine
-
0%
d) Phenylalanine
Q.18.
Ethylene is metabolic product of ... ...
-
20%
a) Valine
-
20%
b) Serine
-
60%
c) Methionine
-
0%
d) Glutamic acid
Explanation
Q.19.
Herbicides are chemicals which control ... ... [ BHU 1994]
-
0%
a) Insects
-
25%
b) Fungi
-
50%
c) Weeds
-
25%
d) Nematodes
Q.20.
Which in not caused by deficiency of mineral nutrition? ... ..... [ CBSE 1997]
-
0%
a) Chlorosis
-
75%
b) Internode shortening
-
0%
c) Necrosis
-
25%
d) Etiolation
Q.21.
Which flower shows nyctinastic movement? ... ... [ Pb. PMT 2005]
-
0%
a) Albizia lebbeck
-
33%
b) Pentapetes
-
33%
c) Mimosa pudica
-
33%
d) Bryophyllum
Q.22.
Leaf of Mimosa droops down on touching because of ... ... [ BHU 2000 ]
-
33%
a) Water loss from leaf bases
-
0%
b) Changes in water concentration
-
33%
c) Loss of water from cells to intercellular spaces in pulvinus and pulvinules
-
33%
d) All the above
Explanation
Q.23.
A long day plant flowers only when it is exposed to ... .... [ AMU 2001]
-
0%
a) Red light
-
67%
b) Light more than critical day length
-
0%
c) Light equal to critical day length
-
33%
d) Light less than critical day length
Q.24.
Some early experiments on phototropic curvature in grasses led to discovery of ... ... [ Pb PMT 1998]
-
33%
a) Auxins
-
0%
b) Gibberellins
-
33%
c) Cytokinins
-
33%
d) None of the above
Q.25.
Hormone found in liquid endosperm of Coconut/Coconut milk factor is ... ... [ AFMC 2007]
-
25%
a) Gibberellin
-
0%
b) Auxin
-
0%
c) Ethylene
-
75%
d) Cytokinin
Q.26.
Day neutral plants ... ... [ JKCMEE 2011]
-
0%
a) Lose activity during day time
-
50%
b) Flower in all possible photoperiods
-
0%
c) Become overactive during day time
-
50%
d) Do not flower in any photoperiod
Q.27.
Which one shows red ⇄ far-red interconversions? .... .. [ BHU 1995]
-
50%
a) Carotenoids
-
0%
b) Cytochromes
-
50%
c) Chlorophylls
-
0%
d) Phytochrome
Q.28.
Hormone antagonist to gibberellins is ... ...
-
0%
a) IAA
-
33%
b) ABA
-
0%
c) Zeatin
-
67%
d) Ethylene
Q.29.
Phytochrome is found in ... ...[ AFMC 2003]
-
0%
a) Algae
-
50%
b) Fungi
-
0%
c) Vascular cryptogams
-
50%
d) Flowering plants
Q.30.
Which is not a phytohormone? ... ... [ Har PMT 1994]
-
50%
a) Phytochrome
-
0%
b) Florigen
-
50%
c) GA
-
0%
d) IAA
Q.31.
Essential requirement for seed germination is ... ... [ CPMT 2005]
-
33%
a) O2 and light
-
33%
b) H2O and O2
-
33%
c) H2O and high temperature
-
0%
d) Scarification and vernalisation
Q.32.
The process of growth is maximum during
-
0%
a) Senescence
-
33%
b) Dormancy
-
33%
c) Log phase
-
33%
d) Lag phase
Q.33.
Cardinal temperature is related to ... .... [ AIIMS 1999 [
-
0%
a) Minimum temperature
-
50%
b) Optimum temperature
-
50%
c) Maximum temperature
-
0%
d) All the above
Q.34.
Which one hastens flowering in plants .... ... [ MHTCET 2011]
-
0%
a) Stratification
-
0%
b) Scarification
-
100%
c) Vernalisation
-
0%
d) Water deficit
Q.35.
Bananas can be prevented from overripening by ... .... [ CBSE 1992]
-
0%
a) Maintaining them at room temperature
-
0%
b) Refrigeration
-
67%
c) Dipping in ascorbic acid solution
-
33%
d) Storing in a freezer
Q.36.
Photoperiodic stimulus is picked up by .... ... [ BHU 2001]
-
100%
a) Phytohormones
-
0%
b) Stomata
-
0%
c) Phytochrome
-
0%
d) Enzymes
Q.37.
hich is essential for flowering .... ... [ Odisha 2012]
-
67%
a) Phytochrome
-
0%
b) Chlorophyll
-
33%
c) Cytochrome
-
0%
d) Leghaemoglobin
Q.38.
Substances that accumulate around a site of infection in plants is ... ... [ JIPMER 1999 ]
-
0%
a) Phytoalexins
-
0%
b) Proteinone
-
100%
c) Saponins
-
0%
d) All the above
Q.39.
Which is not an influence of auxins .... ... [ KCET 2006]
-
0%
a) Tropical movements
-
50%
b) Bolting
-
50%
c) Parthenocarpy
-
0%
d) Apical dominance
Q.40.
Internodal elongation is stimulated by ... ... [ JKCET 2012]
-
0%
a) Auxin
-
33%
b) Phenol
-
0%
c) Cytokinin
-
67%
d) Gibberellin
Q.41.
Movement of auxin is ... ... [ CBSE 1994]
-
0%
a) Centripetal
-
0%
b) Basipetal
-
0%
c) Acropetal
-
100%
d) Both b and c
Q.42.
Shedding of leaves, flowers and fruits due to change in hormone balance in plants is ... ... [ JKCMEE 2005]
-
50%
a) Senescence
-
0%
b) Abscission
-
50%
c) Photoperiodism
-
0%
d) Vernalisation
Q.43.
Abscisic acid causes ... ... [ CBSE 1999 ]
-
0%
a) Seed dormancy
-
0%
b) Apical dominance
-
67%
c) Root initiation
-
33%
d) Phototropism
Q.44.
Growth of lateral branches is promoted by ... ... [ KCET 2002]
-
0%
a) Removal of axillary buds
-
50%
b) Auxin application over decapitated apex
-
50%
c) Auxin application over apical bud
-
0%
d) Removal of apical bud
Q.45.
In short day plants, flowering is induced by ... ...[ BHU 2001]
-
50%
a) Photoperiod less than 12 hours
-
50%
b) Photoperiod below a critical length and uninterrupted long night
-
0%
c) Long night
-
0%
d) Short photoperiod and interrupted long night
Q.46.
Which ones are long day plants... .. [ Guj CET 2007]
-
0%
a) Wheat, Poppy, Soybean
-
100%
b) Wheat, Poppy, Beet
-
0%
c) Wheat, Oat, Soybean
-
0%
d) Wheat, Xanthium,
Q.47.
Transport of cytokinin in the plant body is ... ... [ CET Chd 2011]
-
0%
a) Basipetal
-
50%
b) Lateral
-
50%
c) Acropetal
-
0%
d) One all sides
Q.48.
Growth plotted against time gives a ... ... [MPPMT 1998]
-
50%
a) Parabolic curve
-
50%
b) Sigmoid curve
-
0%
c) Upright line
-
0%
d) Horizontal line
Explanation
Q.49.
Rosette habit of cabbage can be changed by the application of ... ... [ KCET 2011]
-
50%
a) ABA
-
0%
b) IAA
-
50%
c) Ga
-
0%
d) Ethephon
Explanation
Q.50.
Phototropism in shoots is attributed to or phototropic movements are due to ... .... [ AMU 1997]
-
33%
a) Auxin
-
33%
b) Gibberellins
-
0%
c) Cytokinin
-
33%
d) Abscisic acid