-
question_answer1)
Which of the following factors influence the process of flowering [BHU 1989, 90]
A)
Acidity of soil done
clear
B)
Water in the soil done
clear
C)
Amount of green pigment done
clear
D)
Photoperiod done
clear
View Solution play_arrow
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question_answer2)
With which of the following process Cholodny-Went theory is concerned [MP PMT 1990]
A)
Phototropism done
clear
B)
Photomorphogenesis done
clear
C)
Photorespiration done
clear
D)
Photoperiodism done
clear
View Solution play_arrow
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question_answer3)
Pigment phytochrome is involved in [AIIMS 1989, 90; BHU 1980, 81; CBSE PMT 1988; RPMT 1992; Kerala CET 2001; 03]
A)
Phototropism done
clear
B)
Photorespiration done
clear
C)
Photoperiodism done
clear
D)
Geotropism done
clear
View Solution play_arrow
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question_answer4)
The red absorbing form of phytochrome gets converted to the far-red absorbing form after getting irradiated at [BHU 1994]
A)
660 nm done
clear
B)
730 nm done
clear
C)
530 nm done
clear
D)
660 nm to 730 nm done
clear
View Solution play_arrow
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question_answer5)
The pigment involved in red-far red light interconversion is [MP PMT 1990; AIIMS 1987; CPMT 1994; CBSE PMT 1995, 2002]
A)
Cytochrome done
clear
B)
Xanthophyll done
clear
C)
Lycopen done
clear
D)
Phytochrome done
clear
View Solution play_arrow
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question_answer6)
Photoperiodism is
A)
Growth curvature in response to light done
clear
B)
Reccurrence of day and night done
clear
C)
Effect of day length and plant growth done
clear
D)
Flowering plant done
clear
View Solution play_arrow
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question_answer7)
Photoperiodism is associated with the formation of
A)
Chlorophyll done
clear
B)
Florigen done
clear
C)
Auxin done
clear
D)
Gibberellin done
clear
View Solution play_arrow
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question_answer8)
Phytochrome is found in [BHU 1985, 87]
A)
Algae done
clear
B)
Fungi done
clear
C)
Vascular cryptogams done
clear
D)
Flowering plants done
clear
View Solution play_arrow
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question_answer9)
Effect of length of day (light duration) on flowering is called [BHU 1979; CPMT 1984; CPMT 1991; JIPMER 2001]
A)
Phototropism done
clear
B)
Photoperiodism done
clear
C)
Photorespiration done
clear
D)
None of the above done
clear
View Solution play_arrow
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question_answer10)
In many plants the change over from vegetative to reproductive phase takes place in response to [NCERT 1978]
A)
The length of the day done
clear
B)
The severity of temperature done
clear
C)
Mainly the food material available in soil done
clear
D)
Oxygen present in the air done
clear
View Solution play_arrow
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question_answer11)
When the dark period of short day plants is interrupted by a brief exposure of light, then the plant [AIIMS 1982; CBSE PMT 1994]
A)
Will not flower at all done
clear
B)
Flower immediately done
clear
C)
Give more flowers done
clear
D)
Turn into a long day plant done
clear
View Solution play_arrow
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question_answer12)
Which of the following hormones can replace vernalization [CBSE PMT 1989; CPMT 1989; BHU 1994]
A)
Auxin done
clear
B)
Ethylene done
clear
C)
Gibberellins done
clear
D)
Cytokinins done
clear
View Solution play_arrow
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question_answer13)
Which of the following is required for formation of flowers in the plants
A)
Adequate oxygen done
clear
B)
Definite photoperiod done
clear
C)
Adequate manure done
clear
D)
Adequate water and minerals done
clear
View Solution play_arrow
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question_answer14)
Maximum growth takes place in
A)
Green light done
clear
B)
Red light done
clear
C)
Blue light done
clear
D)
Ultraviolet light done
clear
View Solution play_arrow
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question_answer15)
Phytochromes are active in [MP PMT 1988]
A)
Blue light done
clear
B)
Green light done
clear
C)
Red light done
clear
D)
None of the above done
clear
View Solution play_arrow
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question_answer16)
Photoperiodic stimulus is received by [MP PMT 1999]
A)
Leaves done
clear
B)
Buds done
clear
C)
Meristem done
clear
D)
Flowers done
clear
View Solution play_arrow
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question_answer17)
For short day plants, the critical period is
A)
Light done
clear
B)
Dark done
clear
C)
Ultraviolet rays done
clear
D)
None of the above done
clear
View Solution play_arrow
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question_answer18)
Which of the following process is called springization or springification
A)
Fertilization done
clear
B)
Pollination done
clear
C)
Vernalization done
clear
D)
None of the above done
clear
View Solution play_arrow
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question_answer19)
If the growing coleoptile tip is cut
A)
Phototropism stops done
clear
B)
Phototropism increase more done
clear
C)
Rate of photoperiodism remains unchanged done
clear
D)
None of the above done
clear
View Solution play_arrow
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question_answer20)
Short night plants are
A)
Long day plants done
clear
B)
Short day plants done
clear
C)
Day neutral plants done
clear
D)
None of the above done
clear
View Solution play_arrow
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question_answer21)
Which of the following is day neutral plant
A)
Tomato done
clear
B)
Cotton done
clear
C)
Sunflower done
clear
D)
All the above done
clear
View Solution play_arrow
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question_answer22)
Garner and Allard have worked on
A)
Biloxy variety of soyabean done
clear
B)
Maryland mammoth variety of tobacco done
clear
C)
Both [a] and [b] done
clear
D)
None of the above done
clear
View Solution play_arrow
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question_answer23)
If dark period is interrupted by red light in SDP, the plant will show
A)
Early flowering done
clear
B)
Delay flowering done
clear
C)
Both possibilities done
clear
D)
No flowering done
clear
View Solution play_arrow
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question_answer24)
Prolongation of continuous darkness will initiate
A)
Early flowering in short day plants done
clear
B)
Delay flowering in short day plants done
clear
C)
Flowering will not be effected done
clear
D)
None of the above done
clear
View Solution play_arrow
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question_answer25)
A plant which needs not less than 10 hours of light to flower is [DPMT 1982]
A)
Long day plant done
clear
B)
Short day plant done
clear
C)
Day neutral plant done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer26)
Name 'phytochrome' was given by [MP PMT 2001]
A)
Mothes done
clear
B)
Borthwick and Hendrick done
clear
C)
Sorokin et al done
clear
D)
Wickson and Thimman done
clear
View Solution play_arrow
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question_answer27)
Reversal of etiolation effect by light is called
A)
Richmond Lang effect done
clear
B)
Red-far red light interaction done
clear
C)
Photomorphogenesis done
clear
D)
Anisotropic wall expansion done
clear
View Solution play_arrow
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question_answer28)
In respect of photomorphogenesis plants are most sensitive to
A)
Blue light done
clear
B)
Red light done
clear
C)
Far-red light done
clear
D)
Ultraviolet light done
clear
View Solution play_arrow
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question_answer29)
Phytochrome is closely related to [RPMT 1999]
A)
Chlorophyll ?e? done
clear
B)
Bacterio chlorophyll done
clear
C)
Phycocyanin ?c? done
clear
D)
Carotinoid done
clear
View Solution play_arrow
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question_answer30)
Phytochrome mediated process is
A)
Plastid orientation done
clear
B)
Flower induction done
clear
C)
Bud dormancy done
clear
D)
All the above done
clear
View Solution play_arrow
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question_answer31)
Which one of the following is an excellent example of physiological preconditioning
A)
Photosynthesis done
clear
B)
Respiration done
clear
C)
Photoperiodism done
clear
D)
Vernalization done
clear
View Solution play_arrow
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question_answer32)
The term 'photoperiodism' was proposed by or The phenomenon of photoperiodism in plants was discovered by [BHU 1982, 85; MP PMT 1987, 94, 2002; CPMT 1987]
A)
Lysenko and Thimman done
clear
B)
Blackman and Skoog done
clear
C)
Garner and Allard done
clear
D)
Chailakhyan and Borthwick done
clear
View Solution play_arrow
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question_answer33)
A hypothetical chemical involved in the flowering of plants is or Chemical agent which has important role in flowering is [DPMT 1986; CBSE PMT 1991]
A)
Gibberellin done
clear
B)
Kinetin done
clear
C)
Indole acetic acid done
clear
D)
Florigen done
clear
View Solution play_arrow
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question_answer34)
Phytochrome is used in [BHU 1986]
A)
Flowering only done
clear
B)
Seed germination only done
clear
C)
Transpiration only done
clear
D)
All physiological processes exhibited by the plants such as seed germination, flowering (photoperiodism), stem elongation and transpiration done
clear
View Solution play_arrow
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question_answer35)
In short day plants (SDP) flowering is induced by [CBSE PMT 1992]
A)
Long night done
clear
B)
Photoperiod less than 12 hours done
clear
C)
Photoperiod shorter than initial value and uninterrupted long night done
clear
D)
Short photoperiod and interrupted long night done
clear
View Solution play_arrow
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question_answer36)
Pigment involved in photo-perception in flowering is [BHU 1991]
A)
Cytochrome done
clear
B)
Carotene done
clear
C)
Lycopene done
clear
D)
Phytochrome done
clear
View Solution play_arrow
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question_answer37)
If the seedlings are grown in darkness [NCERT 1980]
A)
They are of the same size as those grown in light done
clear
B)
They are much healthier than those grown in light done
clear
C)
They are similar to those grown in light done
clear
D)
They are taller than those grown in light done
clear
View Solution play_arrow
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question_answer38)
The practice of subjecting seeds to low temperatures for a period of time in order to cause growth and flowering during summer season is called [CPMT 1983; BHU 1985; MP PMT 1990; CBSE PMT 1992]
A)
Wintering done
clear
B)
Vernalization done
clear
C)
Devernalization done
clear
D)
Thermolysis done
clear
View Solution play_arrow
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question_answer39)
Phytochrome is [MP PMT 1993]
A)
Absorption of blue light by leaves done
clear
B)
Absorption of PR and PFR in reversible manner done
clear
C)
Absorption of red light with wavelength 660mm done
clear
D)
Absorption of far-red light with wavelength 740mm done
clear
View Solution play_arrow
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question_answer40)
In blue-violet colour light
A)
Internodal growth is pronounced done
clear
B)
Increase size of lamina of leaf done
clear
C)
Both [a] and [b] done
clear
D)
Reduces the expansion of leaves done
clear
View Solution play_arrow
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question_answer41)
In Nigella
A)
Seeds germinate in the intermittent light done
clear
B)
Seeds germinate if exposed to light done
clear
C)
Light may inhibit the process of seed germination done
clear
D)
None of the above done
clear
View Solution play_arrow
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question_answer42)
Florigen is synthesized in [RPMT 1995]
A)
Stem done
clear
B)
Leaves done
clear
C)
Root done
clear
D)
Fruits done
clear
View Solution play_arrow
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question_answer43)
Which of the following factors affect growth to a great extent
A)
Duration of light done
clear
B)
Direction of light done
clear
C)
Intensity of light done
clear
D)
Wavelength of light done
clear
View Solution play_arrow
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question_answer44)
Generally the internode of a plant elongates most in
A)
Ultraviolet light done
clear
B)
Infra-red light done
clear
C)
Blue wavelength of light done
clear
D)
Complete spectrum of visible light done
clear
View Solution play_arrow
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question_answer45)
Two seeds are germinated, A in light and B in dark. Which of the two grows much taller in initial stage
A)
A > B done
clear
B)
B A done
clear
C)
A = B done
clear
D)
No growth occurs in any of them done
clear
View Solution play_arrow
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question_answer46)
A dark grown pale and undifferentiated seedling is called
A)
Morbid done
clear
B)
Etiolated done
clear
C)
Pallolated done
clear
D)
Chlorotic/Variegated done
clear
View Solution play_arrow
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question_answer47)
A green plant turns pale when transferred to prolonged darkness. It represents a phenomenon called [AFMC 1986]
A)
Etiolation done
clear
B)
Chlorosis done
clear
C)
Cytorrhisis done
clear
D)
Paleolation done
clear
View Solution play_arrow
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question_answer48)
A pigment responsible for light sensitivity in plants is
A)
Chlorophyll done
clear
B)
Carotene and xanthophyll done
clear
C)
Cytochrome done
clear
D)
Phytochrome done
clear
View Solution play_arrow
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question_answer49)
Which treatment is effective in red-far red response of plants
A)
First treatment done
clear
B)
Last treatment done
clear
C)
Middle treatment done
clear
D)
Sum total of treatment done
clear
View Solution play_arrow
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question_answer50)
The red-far red response is mediated by
A)
IAA done
clear
B)
GA done
clear
C)
CK done
clear
D)
ABA done
clear
View Solution play_arrow
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question_answer51)
Physiologically active form of phytochrome is
A)
P 660 done
clear
B)
P 730 done
clear
C)
P 860 done
clear
D)
Mixture of all done
clear
View Solution play_arrow
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question_answer52)
Photoperiod is an important factor which affects
A)
Flowering in many plants done
clear
B)
Moulting and migration in many temperate birds done
clear
C)
Breeding behaviour of some insects done
clear
D)
All the above done
clear
View Solution play_arrow
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question_answer53)
A change from vegetative to reproductive phase in plant occurs in response to
A)
Food available in plants done
clear
B)
Change in temperature done
clear
C)
Change in duration of light done
clear
D)
View Solution play_arrow
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question_answer54)
Which of the following exerts profound effect on the reproductive growth of a flowering plant [Wardha 1985; EAMCET 1985]
A)
Quality (colour) of light done
clear
B)
Quantity (intensity) of light done
clear
C)
Direction of light done
clear
D)
Duration of light cycle done
clear
View Solution play_arrow
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question_answer55)
The flowering response of plant can be changed by
A)
Inducing mutations done
clear
B)
Photoperiodic treatment done
clear
C)
Injecting enzymes done
clear
D)
Somatic hybridization done
clear
View Solution play_arrow
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question_answer56)
What is the action spectrum of photoperiodism [BHU 1982]
A)
430 and 660 nm done
clear
B)
640 and 660 nm done
clear
C)
660 and 730 nm done
clear
D)
700 and 900 nm done
clear
View Solution play_arrow
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question_answer57)
What is the effect on the flowering of a plant if a flash of red light is followed by a flash of far-red light [AIIMS 1985]
A)
Flowering is increased done
clear
B)
Flowering is decreased done
clear
C)
Flowering is stopped done
clear
D)
Effect of red flash is reversed done
clear
View Solution play_arrow
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question_answer58)
If a tree flowers thrice in a year (October, January and July) in Northern India, it is said to be [CBSE PMT 1997]
A)
Photosensitive but thermo-insensitive done
clear
B)
Thermosensitive but photo-insensitive done
clear
C)
Photo and thermo-insensitive done
clear
D)
Photo and thermosenitive done
clear
View Solution play_arrow
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question_answer59)
Which of the following process is never affected by light in a vegetable garden [AFMC 1982, 85]
A)
Seed germination done
clear
B)
Flowering done
clear
C)
Osmosis and fertilization done
clear
D)
Food manufacture done
clear
View Solution play_arrow
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question_answer60)
Chrysanthemum flowers either in winter season or in evening because it is a
A)
Short-day plant done
clear
B)
Long-day plant done
clear
C)
Day-neutral plant done
clear
D)
Mid-day plant done
clear
View Solution play_arrow
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question_answer61)
Which of the following pigment is present in two forms [CPMT 1995]
A)
Cytochrome done
clear
B)
Florigen done
clear
C)
Phytochrome done
clear
D)
Vernalin done
clear
View Solution play_arrow
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question_answer62)
For germination of seed, which light is necessary [AFMC 1996]
A)
Red light done
clear
B)
Green light done
clear
C)
Far-red light done
clear
D)
Blue light done
clear
View Solution play_arrow
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question_answer63)
What will happen if several bulbs are lighted in soyabean fields in the night
A)
Production will be more done
clear
B)
Production will be normal done
clear
C)
Production will be less done
clear
D)
No effect done
clear
View Solution play_arrow
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question_answer64)
Phytochrome plays important role in
A)
Photosynthesis done
clear
B)
Respiration done
clear
C)
Photorespiration done
clear
D)
Photomorphogenesis done
clear
View Solution play_arrow
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question_answer65)
Most of the plants are seasonal due to [MP PMT 1997]
A)
Photoperiodism done
clear
B)
Phototropism done
clear
C)
Photosynthesis done
clear
D)
Photolysis done
clear
View Solution play_arrow
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question_answer66)
The phytochrome was discovered by [MP PMT 1998, 2002]
A)
Garner and Allard done
clear
B)
W. Went done
clear
C)
F.F. Blackman done
clear
D)
F.E. Fritsch done
clear
View Solution play_arrow
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question_answer67)
The effect of daily light period on flowering is called [CPMT 1999]
A)
Photoperiodism done
clear
B)
Photo-oxidation done
clear
C)
Phototropism done
clear
D)
Photorespiration done
clear
View Solution play_arrow
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question_answer68)
The response of different organisms to the environmental rhythms of light and darkness is called [CBSE PMT 1998]
A)
Phototaxis done
clear
B)
Phototropism done
clear
C)
Vernalization done
clear
D)
Photoperiodism done
clear
View Solution play_arrow
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question_answer69)
Phytochrome becomes active in [CBSE PMT 1998]
A)
Green light done
clear
B)
Blue light done
clear
C)
Red light done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer70)
The pigment involved in photomorphogenetic movements is [BHU 2000]
A)
Phytochrome done
clear
B)
Cytochrome done
clear
C)
Chlorophyll done
clear
D)
Xanthophyll done
clear
View Solution play_arrow
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question_answer71)
Phytochrome is sensitive to [BHU 2001; Pb. PMT 2004]
A)
Red light done
clear
B)
Far red light done
clear
C)
Green light done
clear
D)
Both [a] and [b] done
clear
View Solution play_arrow
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question_answer72)
Proteinaceous pigment which is the centre of activities concerned with light is [CBSE PMT 2001]
A)
Phytochrome done
clear
B)
Chlorophyll done
clear
C)
Anthocyanin done
clear
D)
Carotenoids done
clear
View Solution play_arrow
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question_answer73)
Which of the following is a long day plant [CBSE PMT 2001]
A)
Mirabilis done
clear
B)
Glycine max done
clear
C)
Mirabilis jalapa done
clear
D)
Spinacia oleracea done
clear
View Solution play_arrow
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question_answer74)
Photoperiodism affects [MP PMT 2001]
A)
Vegetative growth done
clear
B)
Internode elongation done
clear
C)
Seed germination done
clear
D)
All of these done
clear
View Solution play_arrow
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question_answer75)
A pigment concerned with both floral induction and seed germination is [MP PMT 2002]
A)
Florigen done
clear
B)
Chlorophyll done
clear
C)
Plastocyanin done
clear
D)
Phytochrome done
clear
View Solution play_arrow
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question_answer76)
Vernalisation is done at [BHU 1999; CPMT 2000; DPMT 2003, 04; BVP 2004]
A)
Lower temperature done
clear
B)
Low light intensity done
clear
C)
Higher temperature done
clear
D)
High light intensity done
clear
View Solution play_arrow
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question_answer77)
In SDP flowering does not occur [BHU 2003]
A)
When intermediate light is given red
far red
red
done
clear
B)
Interrupted by a flash of far light done
clear
C)
D)
All of these done
clear
View Solution play_arrow
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question_answer78)
The maximum growth rate occurs in [CBSE PMT 2004]
A)
Lag phase done
clear
B)
Exponential phase done
clear
C)
Stationary phase done
clear
D)
Senescent phase done
clear
View Solution play_arrow
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question_answer79)
One set of a plant was grown at 12 hours day and 12 hours night period cycles and it flowered while in the other set night phase was interrupted by flash of light and it did not produce flower. Under which one of the following categories will you place this plant [CBSE PMT 2004]
A)
Day neutral done
clear
B)
Short day done
clear
C)
Long day done
clear
D)
Darkness neutral done
clear
View Solution play_arrow
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question_answer80)
When flowering is regulated by length of day and night, it is called [Orissa JEE 2004]
A)
Photoperiodism done
clear
B)
Phototropism done
clear
C)
Nyctinasty done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer81)
Phytochrome occurs in two forms. In which form it promotes the germination of seeds of some species [CPMT 2004]
A)
B)
C)
Both forms done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer82)
If plants are given only visible light it's growth will [MP PMT 2005]
A)
Increase done
clear
B)
Decrease done
clear
C)
Unusual form done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer83)
Photoperiodism is substituted by [MP PMT 2005]
A)
Temperature done
clear
B)
Mineral nutrient done
clear
C)
Vit done
clear
D)
Iron done
clear
View Solution play_arrow
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question_answer84)
Short day plant initiate flowering if [AMU 2005]
A)
Light period is interrupted due to the darkness done
clear
B)
Dark period is interrupted due to light done
clear
C)
In both a and b conditions done
clear
D)
None of the above done
clear
View Solution play_arrow
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question_answer85)
Short day plant is [Orissa JEE 2005]
A)
Xanthium done
clear
B)
Pisum done
clear
C)
Cucumis done
clear
D)
Avena done
clear
View Solution play_arrow
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question_answer86)
The period of suspended growth due to exogenous condition is termed as [J&K CET 2005]
A)
Quiescence done
clear
B)
Dormancy done
clear
C)
Perennation done
clear
D)
Hibernation done
clear
View Solution play_arrow
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question_answer87)
The movement of organs in response to light is called [J&K CET 2005]
A)
Hydrotropism done
clear
B)
Thigmotropism done
clear
C)
Phototropism done
clear
D)
Geotropism done
clear
View Solution play_arrow
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question_answer88)
Which of the following is a short day plant [HP PMT 2005]
A)
Wheat done
clear
B)
Barley done
clear
C)
Larkspur done
clear
D)
Dahlia done
clear
View Solution play_arrow
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question_answer89)
The low temperature treatment that reduces the period between sowing and flowering is called [AMU 2005; HP PMT 2005]
A)
Chemostaxis done
clear
B)
Vernilization done
clear
C)
Freezing injury done
clear
D)
None of the above done
clear
View Solution play_arrow